Three trees can do the job of 15air-conditioners _________ almost all day.
#48595
A
run
B
are running
C
ran
D
running
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His father often tells him _______ in that river because it’s dangerous.
#50031
A
not to swim
B
not swim
C
swim
D
to swim
--- What should I do, doctor? --- healthy, you should take more exercise.
#50593
A
Keep
B
To keep
C
Keeping
D
To keep out
Don’t worry! I’ll do what I can you when you are in trouble.
#48432
A
to help
B
help
C
helping
D
helped
Every student in Miss Chen’s takes turns __________ the classroom every day.
#51336
A
clean
B
cleans
C
cleaning
D
for
Mr. Bean enjoys jokes and often makes us .
#49082
A
to tell, to laugh
B
tells, laugh
C
telling, laugh
D
telling, laughing