Water is the most important of all the things we eat and（1）. Not many people understand this, but it’s quite
21. The human body can go without food for a long time, yet two or three days without water can usually make people die.
Many people don't know how（3）water the human body needs to work well, and many people do not drink enough, 24in hot weather. Our body is mostly water about 65 ％ to 75 ％. If we don't have enough, we'll feel （5）
and many will get ill. So you know how important water is to us all.
4、______

A.much

B.tired

C.even

D.true

E.drink