补全对话

根据对话内容，从方框内所给的选项中选出最佳选项，将其序号写在方框下面的横线上，选项中有两项为多余项。

(Dawei comes across Li Lei,who is studying in the school library．)

A：Hi,Li Lei．Are you busy with your homework now?

B：Oh,yeah,Dawei．And you?

A：I'm here for a book．Hey,Li Lei．Have a break! We should be outside in the fresh air．It's good for us．

B：Sorry,I can't．　　1　　 I must hand it in tomorrow．

A：Oh,I see．But we can't always stay indoors．We must often take exercise．　　2　　

B：Never．I hardly have time now．A sea of homework almost takes up all my free time．It's sad but that is life．　　3　　

A：You mean my life? In fact,I'm also very busy like you．But you know I like sports．　　4　　 Whenever I have a little time,I will do them．

B：No wonder you are so energetic．

A：Yeah,better health,better grades．　　5　　

B：Yes,you are right．It sounds as if I should also try to exercise often in the future．Dawei,shall we play basketball for a while now?

A：OK．Let's go!

1．________

2．________

3．________

4．________

5．________