解题思路： 首先根据题目要求列出写作提纲，然后正确书写就可以了
解题过程：
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!
作为青少年，我们应时刻注意安全。那么如何保证自己的安全呢？以下是我的一些建议。首先，交友时需谨慎，网上交友尤其要留心。第二，当我们处于危险之中时，应及时寻求警察的帮助以保证人身安全。第三，我们要注意饮食安全。食用过期的食品对我们的身体有害。最后一点，夏天就要到了，我们一定要记住，在河里游泳很危险。
总之，牢记安全第一！
