1．
Complete the following passage with
the words or phrases in the box. Each can only be used once. (将下列单词或词组填入空格。每空格限填一词，每词只能填一次）
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A. undrinkable B. survive C. resources D. breathe E. oxygen
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People can imagine life without water. Without it, the earth we live on would
be a dead one. There would be no trees, no crops, no animals and no people. So water
is considered to be next to in importance.
Although nearly three quarters of the earth's surface is covered with water,
it is sea water and .
The demand for water is increasing, while water are
scarce.
Agricultural production needs enormous amounts of water, so does industry.
Besides, the rapid growth of population makes it more and more difficult for people
tobecause
of the water shortage. So water shortage has become one of the most serious problems.
