A: Good morning, David.

B: Good morning, Cindy ?

A: My first class is math. It's at 8:00.

B: ?

A: No, I don't like it. It's boring. ?

B: I like it and I think it's interesting.

A: ?

B: No, my favorite subject is history.

A: History is interesting.  ?

B: Mr. Wang. He is a nice teacher and we like him so much.