选择合适的句子补全对话。

A. What a beautiful song! B. What is it? C. What's he doing? D. He's wearing a funny hat. E. She is singing a very famous song.

Bob: Look at Peter.

David: Wow. How cool!

Bob: He is telling a story.
David: What's Lily doing?

Bob:

David: Super! What are you doing?

Bob: I'm drawing.

David: Drawing? Haha.

Bob: It is a house.