Four hundred dollars for just a pair of shoes? You ______ be joking!
#76474
A
may
B
can
C
can’t
D
must
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Without gravity, we _____ walk on the ground as freely as we do now. 
#63085
A
couldn’t
B
mustn’t
C
shan’t
D
needn’t
Some of my classmates _________ after school every day.
#77681
A
walks home
B
walk home
C
walk to home
D
goes home