根据短文内容和首字母提示，在下文空格处填入适当的词使短文完整。（每空一词）
Everyone knows that exercise is important. We all need to exercise. Doctors say i _【小题1】it is good for us. It makes your heart and body sstrong 【小题2】ways . Children who often exercise are more alert（灵活的）. This means they do better in tests and schoolwork than those who don’t exercise.
There are many wexercise 【小题3】much to exercise. You can walk, run, swim, skate, or play ball games. Make sure you etwice 【小题4】right in the following ways: you have to like what you’re doing. Exercise enough --- but not too mlots 【小题5】fit . It’s best to exercise ttogether 【小题6】 each week. Thirty minutes each time is enough. Try all kinds of things until you find one, two or even three sports that feel r 【小题7】 for you.
You can exercise at fitness centers (健身中心). They have l 【小题8】 of equipment （设备） there . The equipment will help exercise your arms, legs and other parts of your body to make you f 【小题9】 . Some people buy equipment for their homes. But it is very expensive.
Exercising can be fun. Friends can exercise t _【小题10】 at a fitness center, or they can play sports together. How do you exercise?
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解析：
【小题1】根据前一句 We all need to exercise“我们都需要锻炼”可知，本句的意思是“医生说它对我们的健康有好处。”这里的“它”就是指的锻炼。所以本题填it。
【小题2】我们都知道，锻炼身体能让我们更加强壮，而根据上文我们知道，这里的it就是指的exercise，它能让你的心脏和身体强壮。所以本题填strong。
【小题3】通过You can walk, run, swim, skate, or play ball games.可知，本句应该是说有许多锻炼的方式。故应该用ways。
【小题4】根据you have to like what you’re doing.“你必须喜欢你正在做的。”可知，本句应该是确保用这种方式进行锻炼。所以应该用exercise。
【小题5】根据Exercise enough --- but not可推知，本句的意思应该是“进行足够的锻炼，但是不能太多”，此处的“太多”是不可数的，所以应该填much。
【小题6】根据句意，本空应该填表示次数的词与each week构成频度短语。表示次数的单个以t开头的只有twice。本句的意思是“最好一周锻炼两次。”
【小题7】根据句意，本空应该填表示“适合的，适当的”，又是以r开头的，所以应该填right。本句的意思是“试一下各种运动，直到找到一种、两种或者三种适合你的运动。”
【小题8】根据句意和of以及l字母，可知空应该是lots。本句的意思是“那里有许多设备。”
【小题9】通过The equipment will help exercise your arms, legs and other parts of your body “这设备将帮你锻炼你的胳膊、腿和你身体的其他部分”可知，这种锻炼能让你健康，但是本空是以f开头的，所以不能用healthy，只能填fit。
【小题10】根据句意和下文中的together可知，本句的意思是“朋友可以一起锻炼”。所以本题填together。