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a_ _ pollution
air pollution
Oops!
Okay!
n_ _ _e pollution
noise pollution
Oops!
Okay!
_o_ _ pollution
soil pollution
Oops!
Okay!
r_ _se
reuse
Oops!
Okay!
p_i_ _n
poison
Oops!
Okay!
re_ _ _le
recycle
Oops!
Okay!
_ _t_ _ pollution
water pollution
Oops!
Okay!
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