回中國, 請求幫助!

請問Pjiang大師:

計劃回中國呆兩個多月。

 1）485 pending。三月四號交485 表和 AP 表。還沒有收道打手印通知。

 2）加拿大公民，現H4 簽證。

Questions:

1) During our 485 pending, could I travel to China?

2) What kind of documents should I have when I go through US border?

3) Should I show H4 stamps or 485 receipt to border office when I go through US border?

Thanks very much for your help！