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.—She must have gone back to the valley. —No, she_________. The entrance to it was nowhere to be found.
#88490
A
mustn’t
B
needn’t
C
couldn’t
D
may not
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 — It is reported that America offered to help us build aircraft carriers. — But many citizens would rather our country __________ one by ourselves.
#86669
A
build
B
will build
C
had built
D
built
 He insisted the person referred ______ put into prison at once.
#87019
A
is
B
be
C
to be
D
should be
If  we ___________some measures, we might have prevented the environmental pollution．
#87466
A
take
B
had taken
C
took
D
have taken
One ought _____ for what one hasn’t done.
#90204
A
not to be punished
B
to not be punished
C
to not punished
D
not be punished
–Where are the students? How could they keep us waiting for so long? –They started an hour ago and they ____ be here in fifteen minutes, I think.
#87940
A
can
B
would
C
should
D
must