[ Vocabulary ]
Pollution can ………. the air we breathe.
A. affect
B. tolerate
C. fluctuate
D. predate

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Perfect and Past Tenses › ViewWe (be) __________ friends since kindergarten.
A. are
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Please try _______________ these shoes to see if they’re the right size
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……………………………………( you/ever/be to United States?
A. Were you ever been
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