1. 补全对话。

A. You are welcome. B. It is mine. C. Let me help you. D. No, it isn't mine. E. I can't find my key.

Linda: What are you doing, Tom?

Tom: I am looking for my key.

Linda: Here is a key. Is this yours?

Tom:

Linda: Let's go to the Lost and Found Case(失物招领处).

Tom: OK.

失物招领处

Tom: Have you got a key?

Mrs. Jones: Yes, we have. Is this your key?

Tom: Yes. Thank you.

Mrs. Jones: