知名度比较高 色大胆小 皮匠 and 小白兔 Xueding12008-05-27 08:34:43

I have a question about where to turn in my I-94.
I went to Canada for a conference and got my H1B stamp at U.S. Consulate. The consulate officer did not take my I-94 card on the I-797 approve notice. I will fly back to China directly from Canada. I am here in Canada less then 30 days.
My question is, where should I turn in my I-94 card before I leave Canada?
Thank you for your help.

在离开美国时将卡将给机场或边检的工作人员！