1. 选择合适的选项补全对话。

A. No, they aren't.       B. Is it Sarah's?      C. No, it isn't.      D. It's Tom's.

Amy: Is this your coat?

Mike:My coat is yellow．

Amy: Are these Bob's shoes?

Mike: They're John's．

Amy: Whose hat is this?

Mike: No, it isn't．It's Lucy's．