Man has a blood tie with nature and nobody can live outside nature. Nature provides us with everything we need: the air we breathe, the water we drink, and the food we eat. For quite a long time after man began to live in the r________(1) of nature, he lived in fear of its destructive forces. He used to regard nature with its e________(2) forces as something hostile to him. And even the forest was something wild and frightening to him. Very often, he was unable to o_______(3) the merest daily necessities though he worked together with others s_______(4) and collectively with his imperfect tools. Through his interaction with nature, man changed it gradually. He cut down forest, cultivated land, t_________(5) various species of plants and animals to different climatic conditions, changed the shape and climate of his environment and t________(6) plants and animals. He s_________(7) and disciplined electricity and compelled it to serve the interests of society. Nonetheless, with the constant e_________(8) of agriculture and industry, man has robbed nature of too much of its i_______(9) resources, polluted his own living environment and caused about 95% of the species that have existed over the past 600 million years to become e________(10) and still many others to be endangered. The previous d______(11) balance between man and nature is on the v_______(12) of breaking down. Man is now faced with the problem of how to stop, or at least to m_______(13) the destructive effect of technology on nature. The crisis of the e______(14) situation has become a global problem. The solution to the problem depends on r_________(15) and wise organization both of production itself and care for Mother Nature. This can only be done by all humanity, rather than by individuals, enterprises or seperate countries.