I never go back to China since I came to US. Now I am planning to use AP to go back to China. Can anybody tell me what kind of other document besides the AP I need to bring with in order to come back? Who will I submit my I-94 to? The airline company will collect it or I need to find immigration place at the airport to submit? I don't have visa stamp for my current status - (I changed my status a couple of times insides US), should I submit the original I-94 card (the white little card) or my current status I-94 document? Do I need to provide any other document besides the passport in order to leave China? Also, I am planning to bring some fish oil, etc with me when I go back to China, do I need to pay tax for that when I enter China? All help are appreciated.