学进去

   Swimming is a good sport (运动). People like swimming ________ water makes people (使人们) feel cool. But if (如果) they swim in a wrong place, it may not be safe (安全). These years, there are many accidents (事故), and most of sufferers (受难者) are ________.

Summer holiday will be here again. I want to give you some advice (建议). First, don’t get into the water when you are alone (单独). ________, don’t get into the water if there is a "No ________ " sign (标志). Third, you should be careful (小心)  in the water. If you remember (记住) these, swimming will be safe and it is ________ for your health (健康).