Much of our waste , especially waste ...... factories , electric - powered stations , the chemical industry and heavy industry , is very dangerous . Fish die .... the lakes , rivers and seas , forest trees die , too . Much of this dangerous ............goes into the air and is carried by the ..... for great distances
The Earth is our home . We .... take care of it , for ourselves , and for our children and grandchildren . This .... we have to keep our environment ........ and clean . The importance of this task is pointed out by ecologists - the scientists ....... study the relations between living things and the environment . .............. , each of us must do everything ....... to keep the land , air and water clean .
Từ cần điền vào chỗ chấm : from , means , in , waste , possible , wind , should , green , However , who
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Sinh Học lớp 12
