—The research on the new flu virus vaccine is challenging and demanding. Who do you think can do the job?—________ my students have a try?
#62321
A
May
B
Must
C
Will
D
Shall
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He ___________ unwisely, but he was at least trying to do something helpful.
#63139
A
may have acted
B
must have acted
C
should have acted
D
would act
--- Tom , why didn’t you answer my call yesterday afternoon?--- Sorry , I didn't hear the phone . I ___________ asleep.
#62840
A
must be
B
must have been
C
could be
D
should have been
---Must I go to medical school and be doctor like you，Dad？--- No, you __________, son. You’re free to make your own decision.
#74745
A
can’t
B
mustn’t
C
shouldn’t
D
don’t have to
—I wonder why Susan looks worried today. —I’m not sure, but she _____a small accident driving here.
#62614
A
could have
B
might have
C
might have had
D
must have had
------Is this ruler Mary’s?------No, it _______Mary’s. Hers is on the desk..
#76705
A
can be
B
can’t be
C
must be
D
mustn’t be