婆婆延期补充材料请教

婆婆来美国满五个月（B-2）时我们为她申请六个月的延期。过了三个月后，USCIS来信要我们补充材料：
1.submit evidence to establish that you have a residence aboard to which you intend to return.
2.submit documentary evidence that you have the ability to financially maintain yourself throughout duration of your stay.
3.have your sponsor submit a statement of support specifying contribution he will make on your behalf, room board, living expense, medical expense, etc.

#1 是房产证，#2是银行存款证明，#3该如何准备？请过来人指教！谢谢！

Merry Christmas and happy new year!

所有跟帖： 

• fill out I-134 and get it notarized. -金色风铃- ♀ (0 bytes) () 12/21/2008 postreply 05:35:19