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AIR ………IS A BIG PROBLEM IN MANY CITIES IN THE WORL...
AIR ………IS A BIG PROBLEM IN MANY CITIES IN THE WORLD (POLLUTE).
BAI KIEM TRA HOC KI I ANH 6
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7. Air ………is a big problem in many cities in the world (POLLUTE).
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7.
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BAI KIEM TRA HOC KI I ANH 6