轻松掌握英语实用口语：旅途防盗

Guard Against Theft

Tom:Where is my backpack?

Marry:I don't know. Where did you leave it?

Tom:I just put it on the chair a while ago, but now it's gone.

Marry:Are you sure?

Tom:Of course, I'm sure. I bet someone stole it.

Marry:Well, you should've kept an eye on it.