根据短文内容，判断句子正(T)误(F)。
Swimming is very popular in summer. People like swimming in summer because water makes them feel
cool. If you like swimming and swim in a wrong place, it may not be safe. These years, quite some people
died while they were enjoying themselves in the water, and most of them were students. But some people are
still not careful when they are swimming. They often think they can swim so well that nothing can happen to
them in the water. Summer is coming again. If you want to go swimming, be careful.
Remember not to get into water when you are alone. If there is a " No Swimming " sign, don't get into
water. In this way, swimming will be safer.
( ) 1. Swimming is one of the best sports in summer.
( ) 2. It may be dangerous to swim in a wrong place.
( ) 3. Many people died when they were enjoying themselves because they couldn't swim.
( ) 4. Most of the swimmers who died in water were men.
( ) 5. " No swimming " means " People mustn't swim here."