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man_1_to make his life easier for many centuries. in doing so, he 2 machines and instruments. they 3 and polluting the world we live in.
in this world around us there are two things that do not belong to any one country; air and ocean water, there is much pollution. people 4 about the air and the water used by everyone. one of the most important pollution problems 5 in the oceans. many ships sail in the ocean water— fishing ships, some ships carrying people, some transporting oil. if a ship 6 some of the oil in the water or trash from the ships 7 into the ocean, the water 8 dirty. many fish 9 in the sea, others 10 contaminated.
the second important problem is air pollution. cars and factories pollute the air we use. it also destroys the ozone layer which protects the earth from the dangerous light of the sun. if we want our children 11 in the same world we live in, or in a better and healthier world, we must learn to protect the water, the air and the earth from pollution.

1 had better trying tries has been trying is trying
2 invented will invent would invent invent
3 worked have worked work have been working
4 concerned are concerned are concerning concern
5 is are have been are being
6 is losing have lost had lost loses
7 put are put is put to put
8 becomes have become will be becoming become
9 will die is dying are dying dies
10 will get is getting are getting gets
11 to live to be living to have lived live

DjRio    2   20.11.2019 23:55    7