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!