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完形填空
1970 was the World Conservation(保護(hù))Year．Everyone must know that the world is in danger． 1 is one example of the 2 ．At one time there were 1,300 different kinds of trees and flowers in Holland(荷蘭),but now only 866 remain(繼續(xù)存在), 3 have been destroyed by modern man．We are changing the earth, the air and the water, and 4 that grows and lives．If we go on like this , we shall destroy ourselves．
What will happen in the future? Perhaps 5 is more important to ask “What must we do now?” The people who will be living in the world tomorrow are 6 young of today．A lot of them know that conservation is necessary．Many are helping to save 7 ．
Now fifteen million young people in many countries are studying 8 and the country around him．In some countries they spend much time as “conservation volunteers．” They plant trees and help to 9 wild birds and animals．
But everyone, 10 young people, must work to save our world．
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