[ Vocabulary ]
Pollution can have serious effects_________ the balance of ecosystem.
A. in
B. on
C. to
D. for
Select your answer:
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Other quiz:
Tenses › ViewSocial media … the way we relate to one another.
A. revolutionized
B. has revolutionized
C. had revolutionized
Phrasal Verb › View
Johnny likes and respects his uncle.
He has always ________ him.
A. looked up to
B. looked up
C. looked for
D. look over
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