1. (2015·南岳模拟) 根据下面短文内容，在短文的空格处填上一个恰当的词。使短文完整、通顺。

    Swimmingis very popular in summer. People like swimming in summer, because water people feel cool. But if you like swimming and swim in a wrong place, it maynot be  . Last summer, more than ten people died when they were enjoying   in the water, and most of  were students. But some people are still not careful in swimming. They often think they swim so well nothing can happen to them in water. Today is July 10^th, summer  coming soon. if you want enjoy swimming in summer, don't forget that better swimmers have died in water. They died only because they were not careful, not because they could not swim. So don't get into water when you go swimming alone, go    your teachers or your parents. If there   "No Swimming" signs near the river or lake,you get into water. If you remember these rules, swimming will be safer.