Our playground is not so tidy and beautiful as before, students must ____ dirty things on it.  
#74989
A
be stopped to throw
B
be stopped throwing
C
stop to throw
D
stop from throwing
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Thomas _____ a soldier, for he is much too short.
#63130
A
needn’t be
B
should be
C
may be
D
can’t be
-May we leave the classroom now?-No, you _______. You _______ to leave until the bell rings.
#74240
A
can't; are allowed
B
mustn't; aren't allowed
C
needn't; are allowed
D
needn't; aren't allowed
-- What’s wrong with your pen?-- The ink ___________ come out.
#62642
A
can’t
B
won’t
C
hasn’t
D
doesn’t
---I didn’t go to work today. ----You _____; it’s Sunday today.
#63665
A
mustn’t have
B
didn’t need to
C
can’t have
D
needn’t have