情景交际：根据语境，用适当的语句完成对话。

Mother: You look a bit worried ,Tony.   1  ?

Son: l seem to be getting heavy these days.

Mother: That's a problem. Can I offer you some advice?

Son:   2   . What do you think I should do?

Mother: on the one hand, you should stop eating too much. on the other hand,_3   .

Son: Some of my friends have told me the same thing ,but l'm too busy to do exercise.

Mother: Then why not join a club on weekends?

Son: But   4  ?Mother: You'll can join  swimming club. You want to learn to swim ,don't you?

Son: That's a good idea. Thank you , Mum.

Mother:   5   . I hope I will help.