根据下面短文内容，在短文的空格处填入一个恰当的词，使短文完整、通顺。每空一词，含缩略词。
“Early to bed, early to rise, makes a man healthy, wealthy(财富) and wise (智慧).”
This is an old English saying (谚语)．Did you hear of it? It means that we must go to bed early andup early in the morning．Then we will keep．We’ll also be rich and clever.
This is true．The body must havesleep to be healthy．Children of young age should have tensleep every day．Children who don’t have enough sleep can’t do their work very well．They won’t be clever and they may not become rich!
The body also needs．Walking, running, jumping, swimming and playing games are all exercise．Exercise the body strong(强壮).
Exercise also helps the blood(血) toaround inside the body．This is very important．Our blood  food to all parts(部分) of our body．The head also needs blood． Exercise helps us to think.