H4 uses AP too, 請問法居士

My current status is H-4 and I have 485 in pending. I have expired F-2 visa stamp in my passport. I want to visit China and back to US with AP. I appreciate if I can get the answers of following questions.

(1)When I leave US port, should I turn in my currently valid I-94 of H-4 or the expired I-94 of F-2 obtained when I got in US five years ago?
(2)Can I still get the new I-94 for H-4 status when I come back and apply for new I-94?
(3) Do I need to show USCIS at US port any other documents except AP for the I-94 for H-4 or 485 pending?

Thanks a lot.