Hongkong has about forty beaches. They are open to all people. Some of the beaches are the best in the world. People can go there for a swim. You can go to most of them by bus. To go to some beaches you have to take a boat. There are toilets, clothes changing rooms and places to buy food and drinks on most of the beaches. You will swim there safely if you do as the following: 1. Don't swim alone. You should go with an adult or your friends. 2. Don't swim right after a meal or when you are hungry or tired. 3. You should not stay in the water too long. 4. Do not go out in a boat if you can't swim or if you're not wearing a life jacket. Remember: A red flag  means that it is dangerous for anyone to go into the water. A blue flag means that it is dangerous for children and weak swimmers to enter the sea. A red flag means that   _  .
it is dangerous for children to swim no one should swim it is dangerous for women to swim only children can swim