When I went to their house, there was no light on. They _____ at home.
#62992
A
can’t be
B
couldn’t be
C
can’t have been
D
mustn’t have been
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 -- Are these _______ all from No. 2 Middle School? -- Yes. They often _________ their free time to help the old here.
#74662
A
volunteers; volunteers
B
volunteer; volunteers
C
volunteers; volunteer
D
volunteer; volunteer
As it turned out to be a problem of no importance , we     so much time looking into it . 
#62607
A
needn’t spend
B
didn’t have to spend
C
needn’t have spent
D
oughtn’t to spend
Today is Wednesday. He _____ be at home. He _____ be at school.
#76066
A
can't; can
B
can't; must
C
mustn't; must
D
mustn't; can
(2013·四川省都江堰市二模)—Mike, I can't find my watch anywhere.—You ________ it while working out.
#62422
A
may have lost
B
could have lost
C
would have lost
D
should have lost