We are using up the world’s petroleum. We use it in our cars and to (17)__________ our buildings in winter.
Farmers use petrochemicals to (18)__________ the soil rich. They use them to kill insects eating plants. These chemicals go (19)__________ rivers and lakes and kill the fish there. Thousands of pollutants also go into the air and pollute it. Winds carry this polluted air to other continents.
Poor farmers use the same land over and over. The land needs a rest so it will be better next year. However, the farmers must have food this year. Poor people cut down forests (20)__________ firewood. In some areas when the trees are gone, the land (21)__________ desert. Poor people can’t save the environment for the future.
This is not a problem for one country or one area of the world. It is a problem for all humans. The people and the nations of the world must work together to (22)__________ the world’s resources.
- A. heat B. heating C. hot D. heated
- A. enrich B. change C. make D. let
- A. to B. toward C. at D. into
- A. of B. for C. with D. at
- A. gets B. changes C. turns D. becomes
- A. recycle B. preserve C. keep D. use
