－ Whose is this blue bike? －It ________ be Mary’s. Her bike is black and white.
#75716
A
must
B
can’t
C
can
D
mustn’t
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— Where’s Lucy ? — She ________ in the office. I saw her there just now.
#75664
A
can’t be
B
must be
C
can be
D
should be
—What do you think we can do for our aged parents?—You ____ do anything except to be with them and be yourself.
#62445
A
oughtn’t to
B
don’t have to
C
mustn’t
D
can’t