4
A. Yes, it is.
B. Yes, I have.
C. I like the city.
D. It's a famous city.
5
A. Who are you?
B. Yes, why not?
C. There is no one here by that name.
D. I don't know.
6
A. Not likely.
B. I often drink tea at home.
C. No, thanks.
D. No problem.
7
A. Let's go.
B. Here you are.
C. Why not?
D. Never mind.