I-94 : what do I do with it ?

[canadiangurl]

I'm a Canadian who has filed a pending AOS. I travelled using my Advanced parole for a trip to Canada earlier this month.
On the way back to the U.S I was given an I-94 My question is what am I supposed to be doing with this record.
I do realize that on the back it say that I have to surrender the permit when I leave the U.S. Where can I do this?

I will be soon going for another trip to Canada with my husband at the end of this month.

[Amard]

Just hold on to it, an I-94 is simply a form that tells them when you arrived and they take it when you depart from the country

[txh1b]

You have to return it at the Canadian Border or to CBP USA. You should return it as it is important. Airline will take it if you are flying out.