27．It's quite early. We ____ worry about the time.

　A．mustn't

　B．may not

　C．needn't

　D．can't

26．---- ____ I get up at five o'clock tomorrow morning?

　----No, you ____ .

　A．Must, can't

　B．Can't, can

　C．Must, needn't

　D．Must, shouldn't

25．----Must I return the book this morning?

　----No, you ____ . But you ____ return it before supper.

　A．needn't, must

　B．mustn't, can

　C．mustn't may

　D．can't. need

24．____ take the man upstairs?

　A．Had I better not

　B．Had I not better

　C．Hadn't I better to

　D．Did I have better not

23．----May I keep the book for two weeks?

　----No, you ____ .

　A．can't

　B．may not

　C．mustn't

　D．might not

22．Put on more clothes. You ____ be feeling cold with only a shirt on.

　A．can

　B．could

　C．would

　D．must

21．Tom ____ it if he doesn't want to.

　A．doesn't need to

　B．need not to do

　C．needs not to do

　D．need not do

20．----May I go now?

　----No, you ____ , You ____ stay here.

　A．needn't; here to

　B．needn't must

　C．mustn't; have to

　D．needn't; has do

19．Mike must work harder at his lessons, ____ ?

　A．needn't he

　B．mustn't he

　C．doesn't he

　D．isn't he

18．---- ____ I watch TV this evening, Mum?

　----Yes, you ____ .

　A．May; may

　B．must; can

　C．Must; may

　D．Need; need