Document:

<PAGE>

                                                                   EXHIBIT 10.33

                       FIFTH AMENDMENT TO LEASE AGREEMENT

THIS FIFTH AMENDMENT TO LEASE AGREEMENT (the "Fifth Amendment") is made and
entered into this 28th day of March, 2001, by and between FIRST INDUSTRIAL, L.P.
a Delaware Limited Partnership ("Landlord"), and OPTICAL SENSORS INCORPORATED, a
Delaware corporation ("Tenant").

                                   WITNESSETH:

WHEREAS, Landlord and Tenant have heretofore entered into a certain Standard
Commercial Lease dated October 7, 1991 (the "Original Lease") pursuant to which
Landlord leased to Tenant and Tenant leased from Landlord certain premises
commonly known as 7615 Golden Triangle Drive, Suite A, Eden Prairie, Minnesota
(the "Premises"); and

WHEREAS, Landlord and Tenant entered into a certain First Amendment to Lease
Agreement dated April 26, 1996 (the "First Amendment"); the Original Lease and
the First Amendment are hereinafter collectively referred to as the "Lease");
and

WHEREAS, Landlord and Tenant entered into a certain Second Amendment to Lease
Agreement dated April 14, 1997 (the "Second Amendment"; the Original Lease,
First Amendment and Second Amendment are hereinafter collectively referred to as
the "Lease"); and

WHEREAS, Landlord and Tenant entered into a certain Third Amendment to Lease
Agreement dated September 3, 1999 (the "Third Amendment"; the Original Lease,
First Amendment, Second Amendment and Third Amendment are hereinafter
collectively referred to as the "Lease");

WHEREAS, Landlord and Tenant entered into a certain Fourth Amendment to Lease
Agreement dated June 1, 2000 (the "Fourth Amendment"); the Original Lease, First
Amendment, Second Amendment, Third Amendment and Fourth Amendment are
hereinafter collectively referred to as the "Lease");

NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency
of which are hereby acknowledged, the parties hereto hereby agree as follows:

1.   Recitals. The foregoing recitals are hereby incorporated as if fully
     rewritten and restated in the body of this Fifth Amendment. All initially
     capitalized terms used but not defined herein shall have the meanings
     ascribed to such terms in the Lease.

2.   Term. The term of the Lease shall commence on June 1, 2001 and shall expire
     March 31, 2002.

3.   Premises. The premises shall total 18,339 square feet; (7,906 square feet
     office, 8205 square feet lab, 2,228 square feet warehouse) located at 7615
     Golden Triangle Drive, Suite A, as attached on Exhibit A.

<PAGE>

4.   Tenant's Proportionate Share. Tenant's Proportionate Share of Operating
     Expenses shall be 14.56%.

5.   Base Rent. Effective June 1, 2001, the monthly Base Rent for the Premises
     shall be $13,604.00.

6.   Contingency. This Amendment is contingent upon a fully executed Amendment
     to Lease between Wizmo, Inc. and First Industrial, L.P. dated April 18,
     2001.

7.   Full Force and Effect. Except as otherwise expressly set forth in this
     Fifth Amendment, all terms, provisions and covenants set forth in the Lease
     shall remain in full force and effect and are hereby ratified and confirmed
     as of the date hereof.

8.   Conflicts. In the event that any of the terms, covenants and conditions of
     this Fifth Amendment conflict with any of the terms, covenants and
     conditions of the Lease, the terms, covenants and conditions of this Fifth
     Amendment shall control.

IN WITNESS WHEREOF, the parties hereto have executed this Fourth Amendment as of
the date and year first above written.

LANDLORD: FIRST INDUSTRIAL, L.P.,      TENANT: OPTICAL SENSORS INCORPORATED, a
a Delaware Limited Partnership         Delaware corporation

By:      First Industrial Realty Trust, Inc.,
         a Maryland corporation, its general
         partner

By: /s/ Arne Cook                      By: /s/ Paulita LaPante
    ------------------------------         -------------------------------------
Its: Regional Director                 Its: President and CEO
     -----------------------------          ------------------------------------<PAGE>

                                                                   EXHIBIT 10.34

                       SIXTH AMENDMENT TO LEASE AGREEMENT

THIS SIXTH AMENDMENT TO LEASE AGREEMENT (the "Sixth Amendment") is made and
entered into this 7th day of January, 2002, by and between FIRST INDUSTRIAL,
L.P. a Delaware Limited Partnership ("Landlord"), and OPTICAL SENSORS
INCORPORATED, a Delaware corporation ("Tenant").

                                   WITNESSETH:

WHEREAS, Landlord and Tenant have heretofore entered into a certain Standard
Commercial Lease dated October 7, 1991 (the "Original Lease") pursuant to which
Landlord leased to Tenant and Tenant leased from Landlord certain premises
commonly known as 7615 Golden Triangle Drive, Suite A, Eden Prairie, Minnesota
(the "Premises"); and

WHEREAS, Landlord and Tenant entered into a certain First Amendment to Lease
Agreement dated April 26, 1996 (the "First Amendment"); and

WHEREAS, Landlord and Tenant entered into a certain Second Amendment to Lease
Agreement dated April 14, 1997 (the "Second Amendment"); and

WHEREAS, Landlord and Tenant entered into a certain Third Amendment to Lease
Agreement dated September 3, 1999 (the "Third Amendment");

WHEREAS, Landlord and Tenant entered into a certain Fourth Amendment to Lease
Agreement dated June 1, 2000 (the "Fourth Amendment");

WHEREAS, Landlord and Tenant entered into a certain Fifth Amendment to Lease
Agreement dated March 28, 2001 (the "Fifth Amendment"); the Original Lease,
First Amendment, Second Amendment, Third Amendment, Fourth Amendment and Fifth
Amendment are hereinafter collectively referred to as the "Lease");

NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency
of which are hereby acknowledged, the parties hereto hereby agree as follows:

1.   Recitals. The foregoing recitals are hereby incorporated as if fully
     rewritten and restated in the body of this Sixth Amendment. All initially
     capitalized terms used but not defined herein shall have the meanings
     ascribed to such terms in the Lease.

2.   Term. The term of the Lease shall expire on March 31, 2005.

3.   Premises. Effective April 1, 2002, the premises shall be reduced to total
     12,087 square feet; (5,331 square feet office, 4,377 square feet lab, 2,379
     square feet warehouse) located in a portion of Suite A, 7615 Golden
     Triangle Drive, as further depicted on the space plan prepared by
     Architects Professional Association, as attached Exhibit A. Landlord shall
     perform the tenant improvements listed on the attached Exhibit B at no cost
     to Tenant.

<PAGE>

4.   Tenant's Proportionate Share. Tenant's Proportionate Share of Operating
     Expenses shall be 10%.

5.   Base Rent. Effective April 1, 2002, the monthly Base Rent for the Premises
     shall be $8,964.53.

6.   Contingency. This Amendment is contingent upon a full execution and
     delivery to Landlord of a Second Amendment to Lease between Wizmo, Inc. and
     First Industrial, L.P. dated January 14, 2002.

7.   Full Force and Effect. Except as otherwise expressly set forth in this
     Sixth Amendment, all terms, provisions and covenants set forth in the Lease
     shall remain in full force and effect and are hereby ratified and confirmed
     as of the date hereof.

8.   Conflicts. In the event that any of the terms, covenants and conditions of
     this Sixth Amendment conflict with any of the terms, covenants and
     conditions of the Lease, the terms, covenants and conditions of this Sixth
     Amendment shall control.

IN WITNESS WHEREOF, the parties hereto have executed this Sixth Amendment as of
the date and year first above written.

LANDLORD: FIRST INDUSTRIAL, L.P.,      TENANT: OPTICAL SENSORS INCORPORATED, a
a Delaware Limited Partnership         Delaware corporation

By:  First Industrial Realty Trust, Inc.,
     a Maryland corporation, its general
     partner

By: /s/ Chris Willson                  By: /s/ Paulita LaPante
    ------------------------------         -------------------------------------
Its: Regional Director                 Its: President and CEO
     -----------------------------          ------------------------------------NUMBER                                                                    SHARES
                                   Food Palace
                              International, Inc.

THIS CERTIFIES THAT

IS THE RECORD HOLDER OF

SHARES OF THE COMMON STOCK OF FOOD PALACE INTERNATIONAL, INC.

transferable on the books of the Corporation in person or by duly authorized
attorney upon surrender of this Certificate properly endorsed. This Certificate
is not valid until countersigned by the Transfer Agent and registered by the
Registrar.

          Witness the facsimilie seal of the Corporation and the facsimile
signature of its duly appointed officers.

Dated:

/s/ Nazar Najor                                                /s/ Daniel Najor
-----------------------           [GRAPHIC OMITTED]           ------------------
    SECRETARY                                                      PRESIDENTSUBSCRIPTION AGREEMENT

                                       AND

                       PROSPECTIVE PURCHASER QUESTIONNAIRE

                         FOOD PALACE INTERNATIONAL, INC.

<PAGE>

                             SUBSCRIPTION AGREEMENT

TO: FOOD PALACE INTERNATIONAL, INC., "The Company", Seller

All investors are subject to the provisions of the subscription agreement and
completion of the prospectus purchaser questionnaire which includes the amount
of shares purchased, the price of the shares, the provisions of receiving the
share certificate(s), and representations and warranties that the purchaser is a
qualified investor who must have a minimum net worth of $250,000 and annual
individual income of $100,000 for each of the two predecessor years or a
combined household income with spouse of $150,000 per year for the two
predecessor years, or other substantial "sophisticated" investor indicators. The
purchaser must complete a prospectus purchaser questionnaire and must comply
with the minimum income and net worth provisions to be a "qualified" investor.

1. The undersigned hereby subscribes for the purchase of common shares of stock,
@$1.00 per share, of Food Palace International, Inc. (the "Company") in
accordance with the terms and conditions of this Agreement.

2. This subscription is one of a limited number of such subscriptions for common
shares of stock of the Company. The execution of this Agreement of the
undersigned shall constitute an offer by the undersigned to subscribe for common
shares of stock in the amount specified below. The Seller, Food Palace
International, Inc., shall have the right (in its sole discretion) to reject
such offer for any reason whatsoever, or, by executing a copy of this Agreement,
to accept such offer. If such offer is accepted, Food Palace International, Inc.
will return an executed copy of this Agreement to the undersigned, along with a
valid share certificate from the Company's transfer agent, National Stock
Transfer, Inc., 1512 South 1100 East, Salt Lake City, Utah 84105. If this
subscription is rejected or if the offering is not consummated for any reason,
the undersigned's subscription payment will be returned, uncashed, as soon as
practicable following termination of the offering or the date of rejection, as
applicable. It is understood that this subscription is not binding on Food
Palace International, Inc. unless and until it is accepted by Food Palace
International, Inc., as evidenced by its execution of this Subscription
Agreement where indicated below.

3. The undersigned hereby makes the following representations and warranties:

     a. The undersigned has been furnished with and has carefully reviewed the
Memorandum and documents attached thereto.

     b. All information provided to the Food Palace International, Inc.,
including that in the Prospective Purchaser Questionnaire, is true and correct
and complete in all respects as of the date hereof.

     c. The undersigned is at least twenty-one (21) years of age and sufficient
legal capacity to execute this Agreement.

     d. The undersigned has sufficient knowledge and expertise in business, and
financial matters to evaluate the merits and risk of an investment.

     e. The  undersigned  is a qualified investor as that term is defined above.

     f. The undersigned has analyzed and reviewed the information contained in
the Company Prospectus contained in the SB-2 Registration Statement and has had
an opportunity to ask questions of and receive answers from the Company, or any
person or persons acting on its behalf, concerning the terms and conditions of
this investment, and all such questions have been answered to the full
satisfaction of the undersigned.

<PAGE>

     g. The undersigned has adequate means of providing for his current needs
and possible personal contingencies and has no need for liquidity in this
investment, and his overall commitment to investments which are not readily
marketable is not disproportionate to his net worth, and his investment in the
shares will not cause such overall commitment to become excessive.

     h. The undersigned understands that the common shares of stock have been
registered under the Securities Act of 1933, as amended (the "Act") pursuant to
the completion of an SB-2 Registration Statement, but not with any state.

     i. The undersigned is acquiring the common shares of stock for his own
account for investment purposes only and is not purchasing the subject shares
for an undisclosed third party.

     j. If the undersigned is a corporation, partnership, trust, or other
entity, it represents:

                   (i) It is duly organized, validly existing, and in good
         standing under the laws of the United States of America, or elsewhere,
         and has all of the requisite power and authority to invest in the
         shares as provided herein.

                   (ii) Such investment does not result in any violation of, or
         conflict with, any term of the charter or bylaws of the undersigned or
         any instrument to which it is bound or any law or regulation applicable
         to it.

                   (iii) Such investment has been duly authorized by all the
         necessary action on behalf of the undersigned.

                   (iv) This Agreement has been duly executed and delivered on
         behalf of the undersigned and constitutes a legal, valid and binding
         agreement of the undersigned.

     The foregoing representations and warranties shall be true and accurate as
of the date hereof and as of the date of delivery of the purchase price to Food
Palace International, Inc., and shall survive such delivery period.

4. Miscellaneous

     a. This Agreement, any amendments or replacements hereof, and the legality,
validity, and performance of the terms hereof, shall be governed by, and
enforced, determined and construed in accordance with, the laws of the State of
Nevada applicable to contracts, transactions and obligations entered into and to
be performed in such State.

     b. This Agreement contains the entire agreement between the parties. The
provisions of this Agreement may not be modified or waived except in writing.

     c. This Agreement and the rights, powers and duties set forth herein shall,
except as set forth herein, bind and inure to the benefit of the heirs,
executors, administrators, legal representatives, successors and assignes of the
parties hereto. The undersigned may not assign any of his rights or interests in
and under this Agreement without the prior written consent of the Food Palace
International, Inc., and any attempted assignment without such consent shall be
void and without effect.

     d. It is understood that this Subscription is offered on a subject top
prior sale basis and is not binding on Food Palace International, Inc. until the
Company accepts it, which acceptance is at the sole discretion of Company, by
executing this Subscription Agreement where indicated.

<PAGE>

5. Subscription. The undersigned hereby subscribes for the purchase of common
shares of stock of Food Palace International, Inc. and encloses payment in the
amount of $ ($1.00 per share) payable Food Palace International, Inc., Special
Account"

                                TYPE OF OWNERSHIP

                                ______ Individual

                                ______ Joint Tenants with Right of Survivorship

                                ______ Tenants in Common

                                ______ Community Property

                                ______ Other

Executed this ______ day of________________, 2002, at __________________________

________________________________________________________________________________

--------------------------------------------------
Print Name

--------------------------------------------------
 Signature of Investor

--------------------------------------------------
 Social Security or other identification number

If the Investor has indicated that the shares will be held as joint tenants,
tenants in common or as community property, please complete the following:

--------------------------------------------------
Print Name of Spouse or Other Investor

--------------------------------------------------
 Signature of Spouse or Other Investor

--------------------------------------------------
Social Security or other identification number
If the Investor is a partnership, corporation or trust, complete the following:

<PAGE>

--------------------------------------------------
Name of Partnership, Corporation or Trust

(affix seal, if any)

By:
    ----------------------------------------------

--------------------------------------------------
Print Name of Individual Signing

--------------------------------------------------
Capacity of Individual Signing

Accepted:

 Food Palace International, Inc.

By:_______________________________________________

Title:____________________________________________

--------------------------------------------------
Date of Acceptance

<PAGE>

                       PROSPECTIVE PURCHASER QUESTIONNAIRE

TO: FOOD PALACE INTERNATIONAL, INC.

To Whom It May Concern:

The information contained herein is being furnished to you in order for you to
determine whether the undersigned may purchase common shares of stock of Food
Palace International, Inc., pursuant to an SB-2 Registration Statement, from the
Company. The undersigned herein states that he (she) is a qualified investor and
has knowledge and experience in financial and business matters and is capable of
evaluating the merits and risks of the proposed investment.

The undersigned further represents that (i) the information contained herein is
complete and accurate and may be relied upon by you and (ii) the undersigned
will notify you immediately of any material change in any of such information
occurring prior to the purchase of the subject common shares of stock.

The undersigned understands and agrees that this questionnaire will be kept
strictly confidential.

In accordance with the foregoing, the following representations and information
are hereby made and furnished by:

--------------------------------------------------
Print Name of Prospective Purchaser

--------------------------------------------------
Signature of Prospective Purchaser

<PAGE>

INSTRUCTIONS: Please answer all questions. If the answer to any questions is
"None" or "Not Applicable," please so state.

 1 Full Name _______________________________________

    Social Security Number ____________________________

    Age ________

    Occupation _____________________________________

    Citizenship___________________  Number of Dependents ___________

 Residential Address:

 ______________________________________________________

 ______________________________________________________

       Please indicate your preferred mailing address:

       (  ) Residential (  ) Business

2.   Was your income (from all sources) for each of the two latest complete
     calendar years more than (check one):

   ______$ 30,000     _____$ 50,000      _____$100,000        _____$150,000
   ______$200,000     _____$250,000     _____$300,000       _____$350,000

     (a) What percentage of your income as shown above was derived from sources
other than salary?

          ___________________%

     (b) Approximately what percentage of your income as shown above remained
after payment of Federal, state and local taxes, and after payment of all
ordinary and necessary living expenses?

          ___________________%

    (c) Does the above income represent your joint income with your spouse?

          Yes _______    No _______

3. Is your income from all sources anticipated for the current tax year in
excess of (check one):

   ______$ 30,000     _____$ 50,000     _____$100,000       _____$150,000
   ______$200,000     _____$250,000     _____$300,000       _____$350,000

     (a) Does the above income represent your joint income with your spouse?

          Yes _______    No _______

<PAGE>

4. Is your net worth as of the date hereof in excess of (check one):

   ______$ 30,000     _____$ 50,000     _____$100,000       _____$150,000
   ______$200,000     _____$250,000     _____$300,000       _____$350,000

     (a)  What percentage of your net worth as shown above is invested in
          restricted securities or investments in marketable securities (stock.
          bonds, debentures, or notes)?

        Restrictive securities     _______________%

        Marketable securities    _______________%

                                                                            %

     (b)  Do these net worth representations include your spouse's assets and
          liabilities?

          Yes _______    No _______

     (c)    What percentage of your net worth as shown above constitutes home,
            furnishings, and automobiles? _____________%

     (d)    What percentage of your net worth as shown above constitutes liquid
            assets (cash or assets readily convertible to cash)? _____________%

5.   For investors other than natural persons:

     (a)  Type of entity.  Corporation _______ Trust _______ Partnership _______
           Other (specify) ___________________

     (b)  Date or organization: ____________________

     (c)  Number of equity owners (stockholders, partners, beneficiaries, etc.):

     (d)    Was the entity formed for the primary purpose of investing in direct
            participation programs or other passive investments?

          Yes _______    No _______

6.   Please supply the following information with respect to the bank (or banks)
     at which you maintain a regular checking account:

    Name of Bank:_____________________________

    Address:__________________________________

    Telephone:________________________________

    Contact:__________________________________

7.   (a) Are you aware that the securities proposed may require your capital
         investment be maintained for an indefinite period of time?

       Yes _______    No _______

<PAGE>

     (b)    Do you have any investments or contingent liabilities which you can
            reasonably anticipate could cause the need for sudden cash
            requirements in excess of cash readily available to you'.'

          Yes _______    No _______

          If "Yes," please explain.

          ----------------------------------------------------------------------

          ----------------------------------------------------------------------

          ----------------------------------------------------------------------

8. Please list your business or professional educational background (schools
attended and degrees obtained):

     Schools                    Degree                       Dates Attended

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

9. Please list any professional licenses or registrations including bar
admissions, accounting certifications, real estate brokerage licenses, and SEC
or state broker-dealer registrations, held by you:

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

10. Please list your principal employment and business activities during the
last five years, as well as any relevant financial experience.

     Employer               Position/Title               Employment Dates

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

11.    Please describe your experience as an investor, including amounts
       invested, in securities, particularly investments in development stage
       company's securities.

------------------------------------------------------------------------------

--------------------------------------------------------------------------------

<PAGE>

12.  Have you participated in other development stage company's  securities?

     Yes _______    No _______

I understand that the Company will be relying on the accuracy and completeness
of my responses to the foregoing questions and I represent and warrant to the
Company as follows:

     i.   The answers to the above questions are complete and cornea and may be
          relied upon by the Company in determining whether the offering in
          which I propose to participate is exempt from registration under the
          Securities Act of 1933, as amended;

     ii.  I will notify the Company immediately of any material change in any
          statement made herein occurring prior to the closing of any purchase.

     iii. I, am a "qualified investor" as that term is defined above and have
          sufficient knowledge and experience in financial and business matters
          to evaluate the merits and risks of the prospective investments; I am
          able to bear the economic risk of the investment and currently could
          afford a complete loss of such investment

    IN WITNESS WHEREOF, I have executed this Prospective Purchaser Questionnaire
this _____ day of____________

-------------------------------            ----------------------------------
Prospective Purchaser                      Prospective Purchaser
Signature                                  Signature

-------------------------------            ----------------------------------
Print Name                                 Print Name

Sworn to me this _____ day of _____________, 200_

-------------------------------
Notary Public

-------------------------------
My commission expires:                            (Notarial Seal)

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