Today I went to OIE. That guy gave me a piece of paper. He said I just need to follow the application procedure on the paper:
1. Completed Form I-539 with $140.00 fee (check or money order made payable to INS);
2. Original Form I-20 signed and dated;
3. Copy of both sides of form I-94;
4. Financial verification;
5. Copies of your spouse's valid Immigration forma: I-94,I-20 ID;
6. Copies of the pages in each individual's passport that include biographical information, passport picture, and passport expirtation.
there is also a note:
NOTE: If you have been offered an assistantship, please include and highlight in your letter:"please grant expedite assistantsgip pending." Also, write on bottom left corner of the enelope "Expedite:Assistantship pending."
I am wondering just these 6 items is enough. Because there are some article on this forum said more material should be submitted.