题目内容
根据所给汉语提示将下列句子补充完整（每空一词）。
81. He often ________ ________ some useful advice. (提出)
82. It’s very dangerous to ________ _______ _______ these viruses without any protection. （暴露在…之下）
83. He ________ the apples _______ four parts. (分成)
84. Plastics have ________ ________ ________ ________many conventional (传统的) materials. (代替)
85. It was so dark he ________ ________ ________her at once. (看不见)
81. puts forward 82. be exposed to 83. divided…into 84. taken the place of 85. lost sight of
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