If customers think the services are worthwhile, I do believe many of them ________ accept and pay for them.
A.had better B.may well C.may as well D.may
From her knowledge of Douglas's habits，she feels sure that the attacker last night ___________Douglas.
A. mustn't have been B. can't have been
C. shouldn't have been D. wouldn't have been
He realized that someone __________ his room. Something important was missing.
A. shouldn’t have entered B. could have entered
C. can’t have entered D. must have entered
It was already dark. Then,I wonder how she ______ through the forest by herself.
A.dared not to go B.dare going C.not dare to D.dared to go
AI will surely be a feature of future life, but it _____ be used responsibly and in a proper way.
A.can B.need C.must D.will
—Must I hand in the homework right now?
—‘That’s the rule． ____________
A.Yes，you can． B.No，you can’t．
C.Yes，you must． D.No，you mustn’t．
