This also keeps the air，soil，water crops________ chemicals.
#25521
A
out of
B
out from
C
free of
D
rid of
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Pleasant music is often played_____classes to make students refreshed and relaxed for a while.
#28721
A
between
B
among
C
over
D
after
Before selecting the curtain for your newly decorated house, it's important to know what colors look great ________ the wallpaper.
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A
on
B
with
C
in
D
against
It was because it had been raining for several days, leading to a flood over the fields and the villages that many people fell _______ without foods and shelters.
#26172
A
by accident
B
in trouble
C
behind schedule
D
on purpose