Help on Greencard Appl !!!!

My wife filed her I-140 and I-485 and EAC and AP had been approved. I also got EAC and AP as her DEPEDENT. Right now, I still hold H1B1 visa, my company has also filed I-140 and I-485 for me recently, but, I haven't got receipts from INS because my company was required to resubmit my application with some new document. My questions are

1. Can I use AP(got as my wife's depedent)to go back China?
2. If I Do use AP, will I lose my H1B1 status? Can I continue to apply I-140 and I-485 by myself?
3. After I come back, need I report to our company or INS and begin to use EAC instead of H1B1 if my HiB1 is invalid?

Your help will be greatly appreicated.