从所给的选项中选择恰当的句子补全对话。

A. I am going to visit the zoo with my friend. B. He is doing his homework now. C. What is your brother John going to do? D. I'm watching TV. E. Where is he now?

Tom: Lily, what are you doing now?

Lily:

Tom: What are you going to do tomorrow?

Lily: Tomorrow is Saturday. 

Tom:

Lily: He is going to play football in the park with his friends.

Tom:

Lily: He is at home.