If prices rise too high, the government has to do something _________ it. 
#77944
A
stop
B
stopped
C
stopping
D
to stop
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The Spring Festival   in January or February.
#77617
A
celebrates
B
is celebrated
C
celebrated
D
was celebrated
—Must I finish my homework now?—No, you _______.
#78209
A
mustn’t
B
may not
C
needn’t
D
don’t