根据短文内容，从选项中选出能填入文中空白处的最佳选项，选项中有一项为多余选项。
Nothing sounds better than a swim on a hot summer day. However, many teens, including some who are good swimmers drown (溺水)each year. When someone is drowning, it's often silent and happens very quickly. 1.____. Here are some tips on how to prevent drowning when you go for a swim.
Never swim alone - even for a moment.You should go swimming with adults and make sure that they are able to keep you safe. 2. ____.
Enter the water carefully and feet first.Go in feet first so that you can know how deep the water is. Diving into unsafe water can lead to serious injuries.
3. ____. Take some time to stretch (拉伸) your body before you enter the water. Get your body prepared and safety will surely follow.
Learn lifesaving skills. 4. ____. CPR is one of the lifesaving skills that can help others who are near drowning.
Choose swimming areas carefully.5. ____.Choose the areas with safety facilities (设施) and lifeguards
Remember: In case of emergency, it's always important to call for help first! All in all, keep swimming safety in mind when you are in and around the water.
A.Do body exercise
B. But it can be prevented
C.Warm up before swimming
D.It's important to have an adult nearby watch for danger
E. Don't go to the swimming areas that you don't know well
F. Many schools and training centers now offer classes to learn these skills