travelling is good for our health.中为什么health不加y.

eating fruit is good for our health 为什么用health .is good for our health. I think drinking milk is good for our health中为什么drink要加ing请说 doing morning exercise is good for our health中,为什么要用is和healt Vegetables and fruit is good for our health中为什么要用is climbing m____ is good for our health. kfc is good for our health. L_ is good for our health. ____enough exercise is good for our health talking e is good for our health Eating vegetables is good for our health中eating可换成to 为什么? Playing sport is good for health.Sport为什么不加s?