搜索了一下本版，得到不少有用信息，我目前准备如下：
Documents:
1. I-539
2. Cover letter
3. Copy of pasport
4. I-94
5. Reference letter from bank
6. $300 check
Mail to: (I'm in NY)
USCIS Vermont Service Center
ATTN: I-539
75 Lower Welden Street
St. Albans, VT 05479
Check Payable to: U.S. Department of Homeland Security
还有什么需要补充或者是更正吗？
另外，又没有cover letter 的 Templete?
谢谢各位！