一、选择题。
1、They ______ do well in the exam.
A、can be able to B、be able to C、can able to D、are able to
2、Shall I get one more cake for you,Dad?
Thanks,but you ______ , I've had enough.
A、may not B、must not C、can't D、needn't
3、You ______ be late for school again next time.
A、mustn't B、needn't C、don't have to D、don't need to
4、Must I do my homework at once?
No, you ______.
A、needn't B、mustn't C、can't D、may not
5、He had better stay here, ______ he?
A、didn't B、don't C、hadn't D、isn't
6、You ______ worry about your son. He will get well soon.
A、needn't B、can't C、mustn't D、have to
7、I ______ tired last night.
A、am B、felt C、looked D、fell