There are some children _____ in the room.
#50736
A
singing
B
sing
C
are singing
D
to sing
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What will you do after___________  your education?
#48897
A
finish
B
to finish
C
finished
D
finishing
–We should do what we can _____ the endangered animals.` --Yes, it’s duty_____ them.
#50588
A
save, to protect
B
save, protect
C
to save, protect
D
to save, to protect
I spent half an hour ___________ my homework. 
#49163
A
finish doing
B
to finish doing
C
finishing to do
D
finishing doing