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: (1)________________
Peter: Really? Who gave it to you?
Sam: (2)________________ I like this DVD very much.
Peter: What is it about?
Sam: (3)________________
Peter: How cool! Can I watch it with you?
Sam: (4)________________
Peter: Thank you.
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