I was walking home from school while suddenly it rained heavy. What should I do? I didn’t have an umbrella and a raincoat with me. I looked around and see some students walking happily under their umbrellas. They must listened to the weather forecast. I began to run and caught in the rain. I kept running until I got to a bookstore which I could wait until the rain stopped and in the same time I could read my favorite books. After about half a hour, the rain stopped and I go home. while改为when
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(答案→)while改为when
解析：
【小题1】while改为when 固定句式be doing sth when…正在做某事在这时…；when是一个并列连词；
【小题2】heavy改为heavily 用副词heavily修饰动词rain。
【小题3】and改为or 上下文之间存在着选择关系，我没有带伞或者雨衣。
【小题4】see改为saw 本句中的and是一个并列连词，前后的时态是一致的，都使用过去时。
【小题5】must后加have 本句表示对过去发生的情况的推测，使用“情态动词+have done”的形式。
【小题6】and后加got / was 固定搭配be caught in遭遇…；
【小题7】which改为where 或前加in 本句是一个定语从句，先行词是a bookstore，后面的定语从句中句子结构很完整，故使用关系副词where或者in which。
【小题8】in—at 固定词组at the same time同时；
【小题9】an 名词hour是以元音发音开始的，故使用an修饰。
【小题10】go—went 并列连词and前面的句子的时态是一样的，都使用一般过去时。