Sometimes smiles around the world ________ be false, hiding other feelings like anger, fear or worry.
#63470
A
must
B
can
C
should
D
would
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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
You _____ her in her office last Friday, she’s been out of town for two weeks.
#62649
A
needn’t have seen
B
must have seen
C
might have seen
D
can’t have seen