After I finished my classes, I walked to home. Suddenly, I saw a dog run towards me.I was very frightening. I guessed that it would attack me, because I started to run before the dog reached to me. Soon, the dog caught up with me, but to my surprised, it ran past me as if it hadn’t seen me. I see some people running after a dog. I asked them the reason why they were chasing after the dog.They told that the dog had bitten his chicken the night before.去to
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(答案→)去to
解析：
【小题1】去to 本句中的home是一个副词，前面不需要使用介词。故to多余。
【小题2】run→running 本句中的固定搭配see sb doing sth看见某人做某事,指这件事情是正在发生的。
【小题3】frightening→frightened 本句中的形容词修饰主语I，故使用过去分词frightened来修饰。
【小题4】 because→so so后面的句中表示结果；because后面接的句子表示的是原因。
【小题5】去掉to 动词reach作为到达的时候，是一个及物动词，后面直接加宾语，没有介词。
【小题6】 surprised→surprise 固定搭配to one’s surprise让某人惊讶的是…
【小题7】see→saw 本文的基本时态是一般过去时，所以这里使用过去式。
【小题8】a→the 本句中的the特指上文提及的那条狗。
【小题9】在that前面加me或told--said 动词tell后面要接双宾语,本句是指告诉我，或者用say后面接宾语从句。
【小题10】his—their 本句是指前面的some people，故使用their。