-Listen! Is Mary playing the piano in the room? --No. It ________ be Mary. She has gone to Hong Kong.
#77454
A
may not
B
needn’t
C
can’t
D
mustn’t
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Keep up good state of mind even if you ________ fail plenty of times.
#62503
A
must
B
will
C
can
D
should
Someone is knocking at the door. It my sister. It's time for her to be back.
#75649
A
can’t be
B
may not be
C
must be
D
mustn’t be