13. In the decade of the 1970s, the United States organized several important ……..(1) on the human environment to study
a very serious problem. We, humans are destroying the………(2) around us. We are using up all of our…..…(3)
resources. WE must learn to conserve….…..(4) or life will be very bad for our children and our grandchildren.
Scientists say there is enough water in the world for everyone. ….…..(5) some countries have a lot of water and some
have only a little. Some areas get all their rain during one season. The rest of the year is………(6)
There are huge forests in the Amazon area……….…(7) Brazil. In other parts of the world there is only…………(8)
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