Liu Kai is my classmate. He is a good student and always ready to help the others. One day on his way school, he saw a little girl crosses the road. A car was ing towards to her quickly and the girl was so frightened to move. The car near hit her. Just then Liu Kai rushed up to her and caught her on the arm. The little girl was saved. She tells him where she lived, but he took her home. When Liu Kai hurried into the classroom, the teacher has already begun his lessons. He told the teacher why he was late. He was then praised for which he had done.was后面加to
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(答案→)was后面加to
解析：
【小题1】was后面加to 固定搭配on one’s way to…在去…的路上；后面的名词school，作为to的宾语。
【小题2】cross改为crossing 本句中的see sb doing sth看见正在做某人做某事；本句中的crossing与谓语动词同时发生。
【小题3】去掉to 前面的towards是一个介词，后面的to是介词是多余的。
【小题4】so改为too 固定搭配too…to…太…而不能….；指这个女孩害怕地不敢动了。So后面要接that从句。
【小题5】near改为nearly 本句中的nearly是一个副词“几乎”；指汽车撞倒她。
【小题6】on改为by 抓住某人的胳膊等四肢与介词by连用。
【小题7】tells改为told 本文的基本时态是一般过去时，故使用过去式。
【小题8】but改为and 上下文之间存在着转折关系，她告诉他住的地方，他带她回家了。上下文之间存在着转折关系。
【小题9】has改为had 前面半句使用过去时，后面有already说明使用过去完成时。
【小题10】which改为what 本句的what引导宾语从句，并在句中作为动词done的宾语。