xiao baitu,can you please answer this question for me?

Dear Xiao Baitu, I have following question want to ask you, and if anyone else know the answer, please let me know.

I received AP in early July last year, so the expiration date on the AP paper is set to July06 2007. I went back to China in December 2006 with AP,the stamp date on my AP paper and my I-94 card was set to Dec 2007.

I have sent the renew application for new AP in 2007, but I have not received it yet.

My question is,I am planning to go back to China in July 2007,
Can I go back with the old AP, or I have to wait until I received the renewal of AP ?
My AP expiration date is based on the AP paper or the stamps on AP and I-94?

Thanks,