A)Thanks for telling me, Mike.
B)How do you do, Dr Smith? Nice to meet you, Dr Smith.
C)Hello, have you ever been to China?
D)How are you these days?
A)But I don't think so.
B)I'm sorry to hear that.
C)It's very kind of you to tell me the news.
A)I don't know if I can.
B)Thanks for asking me.
C)No, I'm afraid not.
A)I'm sorry to hear that.
B)Late is better than never.
C)I afraid it's too late. Shall we make it earlier?
D)Either B or C.
A)I'm afraid not. The water in the river is very dirty now.
B)Yes, it's much better than swimming in the pool.
C)It's a pleasure to swim with you.
D)Enjoy yourselves with your friends.