Swimming is very popular in summer.People like swimming in s

Swimming is very popular in summer.People like swimming in summer because water m____ people feel cool.If you like swiming and swim in a wrong place,it may not be safe.Last summer,more than ten people died w____ they were e____ themselves in the water,and m____ of them were students.But some people are s____ not careful in swimming.They often think they swim so well that n___ 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 patents.If there is "No s_____" sign,don't get into water ,either.If you r____ these,swimming will be safer.这道题是这样要求的：在空白处写出适当的单词,单词的首字母已经给出,要注意词形的变化.另外说一下这段短文的意思!