为了进一步增强中学生的安全意识，提高自我保护能力，某校开展了以"安全为主题的英语演讲比赛。请你根据以下要点提示写一篇演讲稿。
注意：1)内容必须包括所给的全部要点，可适当发挥；
2)表达清楚，语句通顺，意思连贯，书写规范；
3)词数80左右。文章开头已给出，不计入总词数。
参考词汇：be careful, on line, danger, call...for, go bad
How to keep safe?
As teenagers we should always keep safety in mind. But how can we keep safe? Here are some of my suggestions.
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How to keep safe?
As teenagers, we should always keep safety in mind. But how can we keep safe? Here are some
of my suggestions. First, we should be careful when we make friends, especially on line. Second, if we are in danger, we must call the police for help in time so that we can keep ourselves safe. Also,we ought to eat healthily and safely. Eating food that goes bad will do harm to our health. Last but not least, summer is coming, and we must remember it's dangerous to swim in the river. In short, safety must come first !
题目分析：这是一篇给材料作文，本文只给出了主要写作要点。写作中要注意从四个方面进行叙述，并自己补充一到两点。动笔前应根据材料内容组织语言，列出简单提纲，确定句子的时态，关键单词等问题。注意不要遗漏要点，做到语句通顺。写作中注意使用连接词，序数词，做到上下文联系紧密，符合逻辑关系