根据短文内容及首字母提示，填写所缺单词，使短文意思完整。
Swimming is very popular in summer. People like swimming in summer because water m______ people feel cool. If you like swimming and swim in a wrong place, it may not be safe(安全的). Last summer, more than ten people died w______ they were e_______ themselves in the water, andm______ of them were students. But some people ares_____ not careful in swimming. They often think they swim so well thatn_____ can happen to them in water. Summer is here again , if you go swimming in summer, don’t forget that better swimmers have died in w______. They d______ only because they were not c______, not because they could not swim. So don’t get into water when you go swimming y______, go with your teachers or your parents. If there are “No Swimming” sign, don’t get into water, either. If you remember these, swimming will be safer.