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!