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—It’s necessary ____ our environment(环境).  —I agree with you.
#50553
A
protect（保护）
B
protecting
C
to protect
D
protects
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Mr Wang does what he can       us improve our English.
#49297
A
help
B
helped
C
helping
D
to help
Plan your time carefully and make sure you have some time ___ what you like every day.
#49137
A
to do
B
doing
C
do
D
done
He preferred to sit rather than_______.
#48715
A
sleep
B
sleeping
C
to sleep
D
asleep
The teacher wants us_______the classroom.
#50196
A
to clean
B
cleans
C
cleaning
D
clean
 — My brother’s ill in hospital.— I’m sorry ______ that.
#49862
A
hear
B
hearing
C
to hear
D
heard