根据对话内容，从下面方框中选出恰当的句子补全对话。

A. I hope our dreams will come true. B. I am going to be a doctor. C. Yes, I am. D. Do you want to be a teacher? E. Because I am good at medical science.

A: Hello! Tony. What are you going to be in the future?

B:

A: Why are you going to be a doctor?

B:  What about you, John?

A: Guess!

B:

A: No, I don't.

B: Are you going to be a football player?

A:  I like playing football very much.

B: Great!