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either, both, all; such that, such as, so that
Pollution is caused ______by man's release of completely new and often artificial substances into the environment, or by releasing greatly increased amounts of a natural substance. ______oil from tan
either, both, all; such that, such as, so that
Pollution is caused ______by man's release of completely new and often artificial substances into the environment, or by releasing greatly increased amounts of a natural substance. ______oil from tanker into the sea.
either, such as
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