People need to breathe. If they don't breathe, they ...(1)..die. If
they breathe (2)..... air, they will have breathing problems and become ill.
Plants (3).... animals need clean air, too. A lot (4)... the things in our lives
create harmful gases and make the air dirty. Dirty air is ca ...
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mk cày ít lắm
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ít cày cx dc bn vô đi
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ok n gày 1 - 2 câu
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