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must/mustn't表达用电规则 — 英语填空题

沪教版·英语(初中) Unit 6 Electricity everywhere AI 三重审校通过

题目
用 must 或 mustn't 填空,使句子符合安全用电规则(每空一词):It is dangerous to leave the heater on all night, so you ___ turn it off before you go to bed, and you ___ ever touch the socket when your hands are wet.