Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Series # | Season # | Episode title | Written by | Directed by | U.S. viewers (millions) | Original air date |
| --- | --- | --- | --- | --- | --- | --- |
| 66.0 | 1.0 | " The Butterfly Effect (Part 1) " | Sheila Lawrence & Henry Alonso Myers | John Terlesky | 5.01 | October16,2009 |
| 67.0 | 2.0 | " The Butterfly Effect (Part 2) " | Sheila Lawrence & Henry Alonso Myers | Victor Nelli, Jr. | 5.18 | October16,2009 |
| 68.0 | 3.0 | " Blue on Blue " | Abraham Higginbotham | Victor Nelli, Jr | 4.55 | October23,2009 |
| 69.0 | 4.0 | " The Weiner, the Bun, and the Boob " | Brian Tanen | Wendey Stanzler | 4.50 | October30,2009 |
| 70.0 | 5.0 | " Plus None " | Cara DiPaolo | Paul Holahan | 4.76 | November6,2009 |
| 71.0 | 6.0 | " Backseat Betty " | Tracy Poust & Jon Kinnally | John Putch | 4.46 | November13,2009 |
| 72.0 | 7.0 | " Level (7) with Me " | Chris Black | John Fortenberry | 3.39 | November27,2009 |
| 73.0 | 8.0 | " The Bahamas Triangle " | Sheila Lawrence | Victor Neili, Jr. | 4.23 | December4,2009 |
| 74.0 | 9.0 | " Be-Shure " | Gail Lerner | David Dworetzky | 4.80 | December11,2009 |
| 75.0 | 10.0 | " The Passion of the Betty " | David Grubstick & Chris Black | S.J. Clarkson | 5.13 | January6,2010 |
| 76.0 | 11.0 | " Back in Her Place " | Abraham Higginbotham | Richard Heus | 4.67 | January13,2010 |
| 77.0 | 12.0 | " Blackout! " | Cara DiPoulo | John Putch | 4.59 | January20,2010 |
| 78.0 | 13.0 | " Chica and the Man " | Gail Lerner | Victor Nelli, Jr. | 4.34 | February3,2010 |
| 79.0 | 14.0 | " Smokin' Hot " | Brian Tanen | John Scott | 4.68 | February10,2010 |
| 80.0 | 15.0 | " Fire and Nice " | Erika Johnson | John Terlesky | 4.10 | March10,2010 |
| 81.0 | 16.0 | " All the World's a Stage " | Abraham Higginbotham & David Grubstick | Andy Wolk | 3.33 | March17,2010 |
| 82.0 | 17.0 | " Million Dollar Smile " | Henry Alonso Myers & Chris Black | Paul Holahan | 4.56 | March24,2010 |
| 83.0 | 18.0 | " London Calling " | David Grubstick & Sheila Lawrence | Mark Worthington | 4.01 | March31,2010 |
| 84.0 | 19.0 | " The Past Presents the Future " | Jon Kinnaly & Tracy Poust | Paul Holahan | 4.03 | April7,2010 |
Question:
Who is the written by when mark worthington is the director?
Answer:
David Grubstick & Sheila Lawrence