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情态动词A1.you_____fail to pass the entrance exam if you do not

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情态动词
A1.you_____fail to pass the entrance exam if you do not study hard.
A.SHALL B.COULD C.MUST D.SHOULD
D2.it has been decided that all the students______stay in the classroom ever on saturday evenings in case they go to internet bars
A.MUST B.CAN C.NEED D.SHALL
C3.-The woman biologist stayed in Africa studying wild animals for 13years 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
A.shall 用于第二和第三人称时,表示祈使语气.
D 同上
D must have done 对过去的动作猜测.