Children are often warned ______ with fire.
#48506
A
not to play
B
to play
C
don’t play
D
doesn’t play
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He thought about  ______Greece or Spain for vacation.
#50051
A
go to
B
to go to
C
going to
D
going
I heard him______ outside.
#50192
A
sang
B
to sing
C
singing
D
sings