As is known to us, all the (burn) ______ of any fuel requires oxygen.burning冠词th

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问题 As is known to us, all the (burn) ______ of any fuel requires oxygen.

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答案 burning

解析冠词the后应该加名词，同时其后的名词短语缺少中心词，所以确定应该填名词或动名词。burn兼有名词词性，但意思是“烧伤”，与本题不符，因此应该使用动名词burning，意为“燃烧”。

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Motherwillneedan______(addition)helptodothework.additional空格前为不定冠词，后是名词