下面是一则有关中学生自我保护的建议书，请你阅读后完成相关内容。每空一词。

Self-protection is one of the most important skills for teenagers. But how can we protect ourselves? Here are some suggestions.

First, We should be careful when we make friends on line, especially don't them alone. Second, if we are in danger, we must call the police for in time, so that we can keep ourselves , Also we should eat healthily and safely. Not only that, we shouldn't crowd each other when we get or get off the bus.

All in all, everyone needs to learn more to protect ourselves and stay from danger.