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1） instruction 隻是說有費用 ， 沒說怎麽付款。 是寫check 和表格一起寄走嗎？check上麵寫給誰也沒講

-You can issue a personal check payable to "U.S. Department of Homeland Security". The payment need to be sent together with the I-131 filing (clip it to the top of the form, not staple it).

2）寄掛號信嗎？

-Either first class or Express is fine. Up to you.

3）我爸媽的表格分開寄對吧

-Yes.