单词拼写(共5小题; 每小题1分, 满分5分)
根据首字母或汉语提示，在句子中填入适当的单词。
【小题1】Bamboo grows up straight and thin, with bbranches drowning invention signal engaged at the top.
【小题2】 He had attempted to rescue the （溺水的）man.
【小题3】The i of the puter marked the beginning of a new era.
【小题4】A red light is usually a (信号) of danger.
【小题5】John is (订婚) to Mary.
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