综合填空。用方框中所给的单词的正确形式填空，使短文正确通顺，每词限用一次（每小题1分，共10分）

when, need, die, important, how, if, become, without, tired, hot

Of all the things we eat and drink, water is the most__小题1:____. Not many people understand this, but it is quite true. The man’s body can go__小题2:____ food for a long time, but two or three days without water usually makes people___小题3:_____.
Many people don’t understand how much water the man’s body __小题4:_____ and they don’t drink enough, especially (特别) in ___小题5:____ weather. Most people drink when they feel thirsty. They often need more water especially ___小题6:_____ they have sports.
____小题7:__ we don’t have enough water, we may feel ___小题8:____ and may ___小题9:____ ill. Now you can see__小题10:_____ important the water is.