把if we keep on wasting so much paper,there will not be any trees left on the earth用or改写.

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把if we keep on wasting so much paper,there will not be any trees left on the earth用or改写.
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把if we keep on wasting so much paper,there will not be any trees left on the earth用or改写.
把if we keep on wasting so much paper,there will not be any trees left on the earth用or改写.

把if we keep on wasting so much paper,there will not be any trees left on the earth用or改写.
We must stop wasting so much paper,or there will not be any trees left on the earth.

we much stop wasting so much paper, or there will not be any trees left on the earth

we should not keep on wasting so much paper,or there will not be any tress left on the earth