根据短文内容，判断短文后的句子是否正确，对的在题前括号内打“√”，错的打“×”。
Swimming is a good sport and it's very popular. In summer people like swimming because water makes
people feel cool. If they swim in a wrong place, it may not be safe. These years, some people died when they
were enjoying themselves in water and most of them were students. These people were not careful in
swimming. They often thought they swam so well that nothing would happen to them in water.
Summer holiday will be here again. If you go swimming, don't forget that better swimmers often died in
water. They died because they were not careful, not because they could not swim. So don't get into the water
when you are alone. Don't get into the water if there is a "No swimming" sign. If you remember these,
swimming will be safe and it's good for your health.
(     )1. People like to swim in summer because swimming makes them popular.
(     )2. Swimming may not be safe if you swim in dangerous places.
(     )3. These years some old people died in water.
(     )4. Some swimmers died in water because most of them couldn't swim.
(     )5. The writer wants to tell us that we must be more careful in swimming.

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