问题描述：
英语修改句子,保持句意不变.
Students mustn't smoke because smoking is harmful to their health.（保持句意不变）
Students _________ ________to smoke because smoking is harmful to their health.
Students mustn't smoke because smoking is harmful to their health.（保持句意不变）
Students _________ ________to smoke because smoking is harmful to their health.
问题解答：
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