Exhibit 4.21
 English Translation
 
 Purchase & Sale Contract for Commercial House




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Explanation
 1.
    
    This contract version is a model version and may also be used as the version for signing.
Before the signing of this contract, the Buyer shall carefully read the contents of this
contract, particularly the optional, supplemented, filled and modified contents. In the case
of different understandings of the provisions and words of this contract, the user may consult
with the local competent real estate administration department. This model version is jointly
prepared by Construction Department of Sichuan Province and Administration for Industry and
Commerce of Sichuan Province.
 2.
    
    Commercial housing mentioned herein means the houses developed, constructed and sold by the
real estate development enterprise.
 3.
    
    Before this contract is concluded, the Seller shall present to the Buyer the presale license
of commercial housing and other related certificates and documentary evidences.
 4.
    
    Both parties hereto shall enter into this contract by following the principles of free will,
fairness and credibility. Neither party shall bend the other party to its will. Both parties
may make amendments, additions or deletions to the terms of this contract version. After this
contract becomes effective, both parties are deemed consenting to the unmodified printed words
in this contract.
 5.
    
    In order to embody the principle of free will, blank lines are left behind the relevant terms
of this contract version for both parties to add separate provisions or supplementary
provisions. The Seller and the Buyer may enter into a fair and reasonable supplementary
agreement with respect to the contents not covered or not specified in detail in this contract
on the basis of the specific situation of the sold project, or may add supplementary
provisions in the blank lines behind relevant terms.
 6.
    
    In this contract version, the optional contents in [], filled contents in blanks and other
contents needing to be deleted or added shall be agreed upon by both parties by mutual
consultation. The optional contents in [] shall be selected with Ö; if the situation
does not occur or is not specified by both parties, blanks shall be marked with  ́ so
as to indicate deletion.
 7.
    
    If any dispute arises in connection with the performance of this contract, either party may
bring a lawsuit with the peoples court in the place where real estate is located or submit an
arbitration application to an arbitration commission for arbitration. In the case of
arbitration, such dispute may be referred to the arbitration commission in the place where the
real estate is located or an arbitration commission in other place.
 8.
    
    Both parties may determine the number of originals of this contract depending on the actual
situation and at the conclusion of this contract, make careful checks to ensure that all the
originals are consistent. Under any circumstance, the Buyer shall retain at least one
original.




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Purchase & Sale Contract for Commercial House
             
 Ö
 Ö




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Article 1 Basis for Project Construction
 2
  Article 2 Basis for Sale of Commercial House
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   Article 3 Basic Information on Commercial House Purchased by the Buyer
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      Article 4 Mortgage
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Article 5 Method and Term of Payment
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  Article 6
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 Article 7 Planning Change
   Article 8 Design Change
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 Article 9 Liability for Delayed Payment
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 Article 10 Delivery Conditions
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 Article 11 Undertakings about Municipal Infrastructures and Other Facilities
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 Article 12 Liability for Delayed Delivery
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 Article 13 Handling of Area Difference




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 ́
  Error ratio of internal
floor area=
    
    Actually measured internal floor
area preliminarily measured internal floor area
Preliminarily measured internal floor area
    
    X 100%
     ́
  Error ratio of
floor area=
    
    Actually measured floor area preliminarily measured floor area
Preliminarily measured floor area
    
    X 100%
  If the Buyer does not surrender the house, house price is settled according to actually
measured area. Overpaid sum is refunded and underpaid sum has to be paid.




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Article 14 Handover Procedures
   If the Buyer does not take over the house within 15 days after the Seller gives a written
notice to the Buyer, it shall be deemed that the Seller has delivered the house to the Buyer on the
16th day after the giving of the written notice and the Buyer shall undertake the
responsibility; any quality problem found by the Buyer during takeover of the house shall be solved
by the Seller within the time reasonably requested by the Buyer.
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 Article 15 Quality, Decoration and Equipment Standards of the Commercial House
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 Article 16 House Warranty Responsibility
    Article 17 Residential Energy-saving Measures
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 Article 18 Covenants of Use
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 Article 19 Property Right Registration
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Article 20 Common Interests
      Article 21 Auxiliary Buildings and Structures
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 Article 22 Prophase Property Service
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Article 23 Special Maintenance Fund
   Article 24 Force Majeure
  Article 25 Dispute Resolution
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  Article 26
 Article 27  ́




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Article 28
 Seller (signature & seal): /s/ Chengdu
Hi-tech Real Estate Co., Ltd.
    
    Buyer (signature & seal): /s/Chengdu
Shidai Noah Education
Software Co., Ltd.Legal representative:
    
    Legal representative: /s/ Dong XuEntrusted agent (signature & seal):
    
    Responsible person:Entrusted sales agency (signature & seal):
    
    Entrusted agent (signature & seal):Signing date: February 20, 2009
    
    Signing date: February 20, 2009Signing place:
    
    Signing place:




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Annex 1: Layout Plan of House and Diagram of its Location in the whole Building (shall mark the
location)
  Annex 2: Description of the Composition of the Allocated Floor Areas of Common Parts and Houses
    Annex 3: Certificate of Mortgagees Consent to the Sale of Commercial House and Relevant Provisions
of Mortgagee and Mortgagor
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 Annex 4: Other Provisions about Pricing and House Price
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 Annex 5: Provisions about Method and Term of Payment
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 Annex 6: Provisions about Decoration and Equipment Standards (refer to House Delivery Standard)
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House Delivery Standard of C2 Building of Tianfu Software Park Phase II
(sale of whole building)
 S/N
    
    Item
    
    Contents1
    
    Construction works
    
    1. Reinforced concrete structure (foundation, beam, sheet,
column)2. Building and plastering of wall body of pipe shaft3. Level of indoor floor with cement mortar4. High-grade face tiles for outer wall, hollow LOW-E glass
curtain wall and complex window5. Fine fitment for staircase6. Person bearing roof is concrete roof.2
    
    Installation works
    
    1. Staircase lighting.2. Toilet plumbing system, rain-water system3. All fire protection works completed.4. Air-conditioning system (adopt water loop heat pump
air-conditioning system. Air-conditioning system is a
warm/cold system. The cold quantity in air-conditioning area
is configured according to relevant design code. For office
area, 180W200W/m2; fresh air quantity in office
area, 30m3/h.p. Condensed water circulating system
connects to floor shaft. Indoor equipment, indoor air pipes,
fresh air system and air outlets shall be installed to be in
place by the lessee or purchaser).3
    
    Equipment works
    
    1. Elevator: C2, 3, 4: 4 elevators; C5: 3 elevators
C6, 7: 4 elevators2. Power load: office power consumption is configured at
120W/m2 (excluding power load of air conditioning).4
    
    Design standard of
use load of house
    
    1. The standard value of design load of fire vehicle passage
is 20KN/m2.2. Standard value of design load of
office: 2.5-3KN/m2 (including partition load of
1KN/m2).3. The standard value of design load of public toilet is 2
KN/m2.4. The standard value of design load of general equipment
house is 5 KN/m26 KN/m2.5. Overload use is strictly prohibited. Otherwise, all the
consequences shall be borne by the user.5
    
    Auxiliary facilities
    
    1. Lighting, power to floor distribution box.2. ELV optical fiber to floor ELV shaft.3. Water supply: connected to point of water use at the toilet.4. Water drainage: drain system adopts the separate system of
storm water and sewage.5. Parking: total number of parking spaces in the basement of
park: about 2800; total number of parking spaces on the
ground: about 750.
 Annex 7: Property Services
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Results
of Real Estate Surveying of Tianfu Software Park Software Outsourcing Base (Area C) 
Actual Measurement
  Office
    
    
    Overhead floor
    
    
    Garage
    
    
    Others
    
    
    OthersBuilding
    
    
    
    
    
    
    
    
    
    
    
    
    
    Number
    
    
    
    
    
    
    
    
    
    
    Number
    
    
    
    
    
    
    
    
    
    
    Number
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    Number
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    NumberNo.
    
    Floor area
    
    
    Floor
    
    
    Area
    
    
    of houses
    
    
    Floor
    
    
    Area
    
    
    of houses
    
    
    Floor
    
    
    Area
    
    
    of houses
    
    
    Name
    
    
    Floor
    
    
    Area
    
    
    of houses
    
    
    Name
    
    
    Floor
    
    
    Area
    
    
    of houses
    
    
    Remarks2
    
    
    18737.67
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -1
    
    
    
    4206.89
    
    
    
    1
    
    
    Bicycle parking
    
    
    -1
    
    
    
    441.41
    
    
    
    1
    
    
    Scientific research, office
    
    
    
    1~5
    
    
    
    14089.36
    
    
    
    303
    
    
    18737.67
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -1
    
    
    
    4206.89
    
    
    
    1
    
    
    Bicycle parking
    
    
    -1
    
    
    
    441.41
    
    
    
    1
    
    
    Scientific research, office
    
    
    1~5
    
    
    
    14089.36
    
    
    
    304
    
    
    18771.23
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    -1
    
    
    
    4214.43
    
    
    
    1
    
    
    Bicycle parking
    
    
    -1
    
    
    
    442.20
    
    
    
    1
    
    
    Scientific research, office
    
    
    1~5
    
    
    
    14114.60
    
    
    
    305
    
    
    8975.54
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    Scientific research, office
    
    
    1~8
    
    
    
    8975.54
    
    
    
    306
    
    
    17422.32
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    Scientific research, office
    
    
    1~8
    
    
    
    17422.32
    
    
    
    487
    
    
    17422.32
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    Scientific research, office
    
    
    1~8
    
    
    
    17422.32
    
    
    
    48743.15
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    Overhead connecting corridor
    
    
    5
    
    
    
    743.15
    
    
    
    4Total
    
    
    100809.89
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    12628.21
    
    
    
    3
    
    
    
    
    
    
    
    
    
    
    
    1325.03
    
    
    
    3
    
    
    
    
    
    
    
    
    
    
    
    86856.65
    
    
    
    220
  Comparison between surveyed area and planned economic and technical index area
 Aboveground
    
    
    UndergroundArea difference ratio
    
    
    
    
    
    
    
    
    
    
    Area difference ratioSurveyed
    
    
    Planned
    
    
    (surveyed area  planned
    
    
    Surveyed
    
    
    Planned

    
    
    (surveyed area  plannedarea
    
    
    area
    
    
    area)/planned area
    
    
    area
    
    
    area
    
    
    area)/planned areaScientific research, office
    
    
    86856.65
    
    
    
    86878.00
    
    
    
    0.000246