1.---Frank isn't in the house now.
---____ left by the back door?
A.Had he B.Must he have C.Should he have D.Could he have
2.I'm sorry ,but I must say his English still___.
A.need to be improved B.needs to improve C.needs to be improving D.needs improving
3.You'll like rhe new school.It ___ be a little small,I think ,but you'll get used to it soon.
A.could B.must C.shall D.should
4.When three pwople travel with me,there____ someone who ____be my teacher.
A.must have ,might B.must be,can C.may be,could D.may have ,may
5.---Mike must have known that.
----No,he ___.How ____ he?
A.mustn't,must B.may not,may C.couldn't,could D.needn't ,need
6.---Where's the knife?
---It ____ on the plate.I put it there just now.
A.could be B.may be C.would be D.should be
7.When she study at university,she ____ stay up very late,reading novels.
A.must B.could C.might D.would
8.The traffic signs show clearly that people ____ faster than speed limit.
A.do not drive B.will not drive C.may not drive D.might not drive
麻烦原因说的详细些,谢了