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!