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?
A．can't
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