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.

　　D)Congratulations.

　　A)I don't know if I can.

　　B)Thanks for asking me.

　　C)No, I'm afraid not.

　　D)With pleasure.

　　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.