题目内容：

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1. 每处错误及其修改仅限一词。

2. 只允许修改10处，多者（从第11处起）不计分。

Last Sunday, I went to the Children’s Park with my parents. We were hanging out while we saw a naughty boy throwing a banana’s skin casual on the ground. Just then, an old man passes by. He was slipped on it and fell down. On saw that, we hurriedly went up and found he was injured. So I called 120 for help immediately and then an ambulance soon arrived and took an old man to the nearest hospital. However, the boy had left before we knew. It was the boy’s casual behavior that caused this accidents. It’s high time that we mind our manners and behaved us.