first time use AP, xiao bai tu and other experts, pls help

My 485 is pending, I140 approved, I am going to use AP to go back to China for a one week short trip in near future.I have following concerns:

1) I am wondering when I come back from China, will china airport allow me to leave with just the air ticket and AP documents? I am currently on H1-B status, but I don't have a valid H1-B visa stamp on my passport. I have a expired F1 visa on my passport and valid H1-B docment.

2) I received 2 original AP paper with my photo on it. When I am at US custom, should I give both of them to the officer?

3) Is there any other important thing I should pay attention to when I am using AP.

Thanks in advance..