题目内容：

从方块中选择适当的句子补全下列对话

A; Hello.                                      B: ___1._____

A:_____ 2._____                               B: Yes， I am.

A : ____3._____                               B: I’m in Class 6

A : ____4._____                               B: I am twelve.

A: Oh，I am twelve too. _____5.______           B: Thank you.

A. Please sit on the chair.

B. What class are you in ?

C. Hello.

D. How old are you?

E. Are you a new student here?