Tom is nice and lovely, but he be very naughty at times.
A.can B.shall C.must D.should
—You rang me up at about 10:00 last night, didn't you?
—No, I didn't phone you. It someone else.
A.must have been B.could be C.must be D.could have been
While it wasn’t the goal of the trip, I was rewarded with fresh insights, ones that ________ to me during the regular course of business.
A.might never happen B.could never have happened
C.should not happen D.needn’t have happened
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
