David： Susan, you like sports, don”t you?
　　Susan： Yes. I have sports every afternoon.
　　David： Do you often go swimming?
　　Susan： Yes, I go swimming once a week.
　　David： I used to swim at middle school, but I don”t have time any more.
　　Susan： That”s too bad! Exercise is very important.
　　David： I know. I am getting fat, you see. Anyway, I don”t want to be heavy.
　　Susan： Well, I”m going to swim this afternoon. Do you want to go with me?
　　David： OK! I really need more exercises. When and where shall we meet?
　　Susan： How about three o”clock, at the swimming-pool?
　　David： All right. Good-bye!
　　Susan： Good-bye!