阅读下面的对话，根据上下文，从所给的七个句子中选择六个句子，将对话补充完整。

Tom: Hi, Sam! ?

Sam: I like winter best.

Tom: Why do you like winter?

Sam: . What about you, Tom?

Tom: I like summer best.

Sam: Which month?

Tom: .

Sam: Oh! Children's Day is in this month, too.

Tom: What about you? ?

Sam: My birthday is in October.

Tom:

Sam: I often have a big birthday party with my friends.

Tom: Cool!

A. It's in June B. What do you often do on your birthday C. When is your birthday D. What do you have on Mondays E. Which season do you like best F. Because my birthday is in it G. Because I like winter vacation