从方框中选择适当的句子补全对话

A. It's a hot dog. B. Thank you. C. May I come in? D. Yes, Miss Li. E. Yes, please.

Mike:

Miss Li: Come in, Liu Tao.

Mike：Thank you.

Miss Li: Look at the blackboard.

Class：

Miss Li: What's this, Helen?

Helen：

Miss Li: Would you like a hot dog?

Helen：