18．---May I go swimming alone this afternoon.Dad?---No.you ．It is dangerous．( )A．may notB．mustn't——青夏教育精英家教网——

18．---May I go swimming alone this afternoon，Dad？---No，you ．It is dangerous．（　　）

17．All of us went to the park_______ Bob．He had to look after his sister．（　　）

16．It's really you to swim in the fiver on such a cold day．You may catch a cold．（　　）

15．Perhaps/Maybe that man is a teacher，but they are not sure．

14．After the big exam in June，don't forget tokeep/stay in touch with each other．

13．You'd better ask your dad foradvice/suggestions before you make a decision．

12．We should take exercise an hour every day to keephealthy/fit．

11．There is a bookshopopposite/across from our school．

10．Mike ________be here，for he has been abroad for ten years．（　　）

9．Lucy prefers _________ in the library rather than ______rock climbing in summer．（　　）

studying，going

to study，going

studying，to go

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