The Earth is ________ home. We must take care of it. We should keep the land, air and water ________. But people on Earth have made a lot of pollution since they could first burn things ________ a fire. They ________ washed in the river and threw away rubbish on the ground. Many years ago, pollution was not so serious because there ________ not so many people.
There was enough clean air, land and water long time ago. ________ the land or water was dirty in one place, people moved to another place. People now, however, are slowly ________ the whole world and there is not enough clean air, land or water.
Perhaps you are afraid ________ is endless(无止境的) for people to make pollution. Luckily, we are glad to tell you that people begin to know the danger of pollution. ________ more and more people are working hard to protect our Earth. We hope one day all the people in the world can enjoy ________ in the clean environment.
| 【小题2】 | | A．clean | B．cleanest | C．cleaner | D．cleaning |
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| 【小题3】 | | A．made | B．making | C．make | D．to make |
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| 【小题4】 | | A．also | B．too | C．either | D．as well |
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| 【小题7】 | | A．polluting | B．pollutes | C．polluted | D．pollute |
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| 【小题10】 | | A．live | B．lived | C．to live | D．living |
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