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People _______the southwest of China were in great need of water a couple of months ago.
#51232
A
in
B
at
C
to
D
on
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I think it’s easy ________you _________English well.
#49537
A
for, to study
B
of, to study
C
with, study
D
for, study
 ---Boys, don’t swim in the Fengcheng River!---Why not? Isn’t it deep enough _____?
#45862
A
to swim across
B
to swim in
C
swim on
D
swimming on
Mary often studies English by _______ with a group.
#49704
A
working
B
work
C
to work
D
worked
Books are helpful _____ us.
#50001
A
from
B
on
C
in
D
to
— What time do you usually get up in the morning?— _ six o'clock.
#50607
A
On
B
For
C
In
D
At