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：内容必须包括所给的全部要点，可适当发挥。
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. Third, we should 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!