One possible version：

It's very important for us students to keep ourselves safe. When we are at home alone, we should always keep our doors closed. Don’t open the doors, when someone is knocking at the doors and you don’t know the person. When we are riding a bike on the road, we should always follow the traffic rules. When we see someone stealing , we should keep an eye on him and learn to fight with him in a clever way.

题目分析：这是一篇给材料作文，介绍学生怎样自我保护。结合所给材料，可知本文主要考查一般现在时态，人称为单数第一人称，注意主谓一致问题，句子结构主要为动宾结构，注意一些常见句式的应用，比如：When we are ......,及 we should......等句式的应用。写作中注意运用代词，注意多种句式交替运用。写作中注意叙述顺序，符合逻辑关系，注意最后写出学生要用聪明的办法与小偷作斗争。

【亮点说明】本文结构紧凑，语言简练。开头介绍了学生自我保护的重要性，接下来介绍在家和在路上如何自我保护，最后指出要用聪明的方法与小偷作斗争。此处用了keep our doors closed. knocking at，riding a bike，keep an eye on， in a clever way. 等这些词组的运用也让文章增色不少。