1 . Language is one of the
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2 . The weather could be one of the _________ (factor) in tomorrow’s game. (所给词的适当形式填空)
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3 . But one of the main ________ has been the Chinese writing system.(factor) (所给词的适当形式填空)
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4 . In building fires, smoke is one of the primary ________ (factor) that lead to death. (所给词的适当形式填空)
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5 . The rise in crime is mainly due to social and economic ____________ (factor). (用所给词的适当形式填空)
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6 . Several________ (factor) have led to the disaster that happened in the small village. (所给词的适当形式填空)
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