I-94 card, Help!!!

I just transfered from F-1 to H1-B, and plan to visit china recently. Now, I have two I-94 cards. One is issued at the US custom when I returned to US from China last time as a F-1 student. Another is issued by the BCIS with H-1B approval form 797. Should I return both of these I-94 cards to the airline company before I leave USA, or just one of them? If only one of them, which one I should return? Any information or advice are highly appreciated.

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• 回複：I-94 card, Help!!! -12135- ♀ (4 bytes) () 10/13/2003 postreply 14:55:00

• 交新的那張，你現在身份是h1b,你轉了身份以後原來那張作廢。 -banaa- ♀ (0 bytes) () 10/13/2003 postreply 15:02:00

• Thanks, but ... -loveipeac- ♀ (123 bytes) () 10/13/2003 postreply 15:07:00

• 回複：Thanks, but ... -banaa- ♀ (129 bytes) () 10/13/2003 postreply 15:19:00

• I see, Thanks!!! -loveipeace- ♀ (0 bytes) () 10/13/2003 postreply 15:28:00