选择恰当的选项，补全对话。

Sam: Hello, Daming.

Daming: Oh, thank you! What's it about?

Sam:

Daming: What do you do at Christmas?

Sam: We sing songs. We give presents and eat lots of food.

Daming:

Sam: Yes, we do.

Daming:

Sam: We say, "Merry Christmas！”

A. We have a Christmas tree. B. Here's a book for you. C. Do you have sweets? D. It's about Christmas. E. What do you say at Christmas?