This kind of computer ______ well both at home and abroad.
A. sold B. are sold C. sells D. sell
Scientists wanted to find out whether these new technologies ______.
A. would be worked B. will work C. will be worked D. would work
New technologies ______ in the building of the plane.
A. had been used B. have used C. have be used D. were used
The room is in a terrible mess; it ______ cleaned.
A. can’t have been B. couldn’t be C. mustn’t be D. mustn’t have been
Kelly has been working on the documents since last Monday. She ______ everything ready but I am not sure.
A. must have got B. may get C. may have got D. ought to get
Johnny, you ______ play with the knife, you ______ hurt yourself.
A. won’t; can’t B. mustn’t; may C. shouldn’t; must D. can’t; shouldn’t
