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A hard-working man        become a great scientist, but a great scientist        be a hard-working man.
#74334
A
can’t; can
B
may not; can
C
can’t; must
D
may not; must
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The light is on in Mr. Green’s room. He _______ be at home.
#77781
A
must
B
can
C
mustn’t
D
can’t
His shoes are muddy. He        be working in an office all day.
#63593
A
mustn ’t
B
can’t
C
needn’t
D
maybe
--- How’s your new babysitter?  --- We ______ ask for a better one. All our kids love her so much.
#63288
A
should
B
might
C
mustn’t
D
couldn’t
We find ------interesting to learn history.
#76975
A
it
B
us
C
that
D
our
—How is the debate of your essay?—It ____ well, but I ____one of the key points.
#62979
A
might work; hadn’t forgot
B
needn’t have worked; forgot
C
could have worked; forgot
D
would work; hadn’t forgot