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处错误, 每句中最多有两处。错误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（）, 并在其下面写出改加的词。删除：把多余的词用斜线（＼）划掉。修改：在错的词下划一横线，并在改词下面写出修改后的词。注意：

1. 每处错误及其修改均仅限一词；

2. 只允许修改10处，多者（从第11处起）不计分。

Recently there had been many reports about teenagers’ safety, in which some of them got hurt and even lost their lives. Besides, it’s necessary for our teenagers to develop self-protection awareness and learn to protect ourselves. But how can we protect ourselves? First of all, we should make a rule to eat healthy food, in case unhealthy food does harm for our health. Second, we should be careful when made friends, especially online. Third, for the sake of our safety and the others’ safety, we should obey the traffic rules. Last but not least, if we are in dangers, we should call the police immediate. All in all, we must keep safety in mind, no matter when and where we are.