回复：回复：current H1 holder准备下月回国visit, AP返回美国.

Such a good question for me too! My case:
2004 came to USA w/H-B visa,
2007-2009 the extended time of H-B,
2010 -now hold an 2-year EAD.
I am going to China in July this year and will come back USA w/AP. Should i give my extended H-B I-94 card to airport when i leave here.
Thank you for helping me.