从方框中选择句子补全下面的对话。

A. It's in your desk. B. Hello, Mike. C. You're welcome. D. Oh! Where is my bag? E. Let's go home!

Amy:

Mike: Hello, Amy.

Amy:

Mike: OK.

Amy: Look! It's under your desk.

Mike: Oh, yes. But(但是)where's my ruler?

Amy:

Mike: Thank you, Amy.

Amy: