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1. I-864, 2017年的W2还没有拿到，2017年的Federal Tax Return也还没有file。可以用2016,2015,2014三年的W2和Tax Return么？-You need to provide the copy of tax return of 2017. If you do not provide it now, USCIS will send you RFE for this document later, then you can provide it at that time
2. I -131 Page1，item 6 class of admission 怎么写？-Check the I-94, e.g. "B2 Visitor".
3. I -131, Page 2, Part 3, item 1.
   1. Date of intended departure可以写 05/01/2018么？-Fine. It does not matter.
   2. 下面Expected Length of Trip(in days)。希望AP的有效期能尽量长一点，这里写多少天比较好？-Any time length less than one year.
4. I -131，Page 3, part 4, item 1a。Purpose of trip。这里怎么写比较好？-e.g. visit relatives and friends.
5. I -131， Page 4,Part 7.

On a separate sheet of paper explain how you qualify for an Advance Parole Document and what circumstainces warrant issurance of advance parole. -Just say "I have pending I-485, so I am qualified for advance parole application".

Include copies of any documents you wish considered. 这个怎么写？-Provide the copy of I-485 receipt notice (if any). If you file it with I-485 filing, ignore it.

6. 我给父母办绿卡，交i-130, i-131和i-485。照片每人几张？是每人4张么？(2张485,2张131)。-Yes.
6. 父母的护照首页，签证页，出入境stamp，I-94, 这些都需要准备两份么(485一份，131一份)？-Yes.