补全对话。

A. My mother gave it to me. B. It's about space travel. C. It's my birthday present. D. Of course.

Peter: What is this?

Sam:

Peter: Really? Who gave it to you?

Sam: I like this DVD very much.

Peter: What is it about?

Sam:

Peter: How cool! Can I watch it with you?

Sam:

Peter: Thank you.