选择恰当的选项，补全对话。

A. Who is that boy? B. Yes, it is. C. ls he a teacher? D. Thank you! E. She is my mother.

A: Who's that woman?

B:

A:

B: He's my brother.

A:

B: No, he isn't. He is a student.

A: ls this your dog?

B:

A: It is so cute!

B: