U.S. Citizenship and Immigration Services
P.O.Box 805887
Chicago, IL 60680-4120
Yes.
2。我不工作,經濟擔保由丈夫填寫,還需什莫證明?
If his income reachs poverty guidline, you will not need anything.
3。這些表是不是父母各填一份?申請費是不是也是兩個人的,郵寄的時候是一起郵寄嗎?還是分開?
You can put them together, but the form and check should be one by one. And best way is to mention which one is for which one.