1. 补全对话

Peter: Hi, Li Yan. 

Li Yan: 

Peter: What's this?

Li Yan: It's my new sweater.

Peter: 

Li Yan: 

Peter: It's a watch.

Li Yan: 

Peter: No, it isn't.

A.Wow, how nice! B.What's that? C.This is my watch. D.Is that your watch?     E.Hi, Peter.