Doing sports every day is good for our heath.主语是什么,为什么 sport

Doing sports every day is good for our heath.主语是什么,为什么 sport 转换同义句Doing some sports every day is good for our healty()goo Doing sports every day is good for your health We think watching TV is good for our heath. Doing morning exercise is good for our health.Every morning Doing eye e______ every day is good for your eyes Fruit is good for our health.I eat ( ) every day. ____ (exercise) every day is good for our health. some vegetables every day is good for our health Doing sports is good for us We all know that doing sports is good for our health Doing exercise every day is necessary for students 该用it做形式主语