1.Helen____go on the trip with us,but she isn't quite sure yet.
A.shall B.must C.may D.can
2.--Do you know where David is?I couldn't find him anywhere. --Well.He____have gone far--his coat's still here.
A.shouldn't B.mustn't C.can't D.wouldn't
3.I was on the highway when this car went past followed by a police car.They____at least 150 kilometers an hour.
A.should have been doing B.must have been doing C.could have done D.would have done
4.--Lucy doesn't mind lending you her dictionary? --She ____,I've already borrowed one.
A.can't B.mustn't C.needn't D.shouldn't
5.Mr. Bush is on time for everything.How___it be that he was late for the opening ceremony?
A.can B.should C.may D.must
6.--I've taken someone else's green sweater by mistake. --It____Harry's.He always wears green.
A.could be B.will be C.mustn't be D.has to be
7.He paid for a seat,when he____have entered free.
A.could B.would C.must D.need
8.--Mr.Gordon asked me to remind you of the meeting this afternoon.Don't you forget it ! --Ok,I ____.
A.won't B.don't C.will D.do
9.Children under 12 years of age in that country___be under adult supervision when in a public library.
A.must B.may C.can D.need
10.--The woman biologist stayed in Africa studying wild animals for 13 years before she returned. --Oh,dear!She____a lot of difficulties.
A.may go through B.might go through C.ought to have gone through D.must have gone through
参考答案:CCBCD,AAAAA
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