用分词的形式改写句子

If we were given more time, we could do it much better．

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用分词的形式改写句子

If it is heated to a high temperature, water will change into vapor．

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用分词的形式改写句子

Though they had been warned of the storm, the farmers were still working in the fields．

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用分词的形式改写句子

When the teacher entered the classroom, he was followed by a group of his students．

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书面表达

Century School Edition Teens对几个城市的中学生视力进行了调查,发现中学生近视眼现象严重,就此现象写一篇100左右的英语短文,向该报投稿,说明保护视力的重要性及其主要措施，题目自拟。

注意：句子中要体现过去分词的用法和至少使用一句倒装句。

参考词汇：nearsighted近视的　survey　n．调查