想聊就聊-2.05.4旅途防盗

M: Where is my back pack?

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

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

W: Are you sure?

M: Of course, I am sure. I bet¹ someone stole it.

W: Well, you should have kept an eye on it.

1 bet   

v.打赌，以(与)...打赌；n.赌注，赌金；打赌

参考例句：

• I bet you can't do this puzzle.我敢说，你解决不了这个难题。
• I offered to bet with him.我提出与他打赌。