Summer is coming. The weather （become）hotter and hotter. A lot of people like swimming in the swimming pools or in the sea. They think water makes （they）feel cool. But some people （not be）careful enough. They often think they can swim （well）than others and they don't have to worry about （something). So these years, many （accident）happened and some people lost their （life）. Most of them were students. As we all know, safety is the most important. Do you know how （protect）yourself? To protect yourself, you must be careful. Remember not to swim in a （danger）place. Don't swim alone, and when you see a "No Swimming" sign, don't swim, either. Of course, you can swim with someone who can keep you safe. If you remember these, swimming （be）safer.