問題詳情：
Our earth is in trouble. Our drinking water is becoming dirtier, and the air is not as clear as before. Rivers, lakes and seas__61____(pollute) by people and __62__(factory). You might think there is nothing you can do__63____(help). That’s not true. There are many things you can do.
A lot of CO₂ is produced into the air when cars burn gasoline. Some people believe that CO₂ makes the earth warmer. they think CO₂ thins the clouds above us. The clouds keep us away from __64___strongest sunlight. So try to walk, ride a bicycle __65___ take a bus. And if you drive a car, drive at a steady speed. This can save some gasoline.
The biggest energy use at home is for keeping warm or cool. So turn the air conditioner(空調) __66___ when you don’t need to use it. Use lights that save fewer things__67___ cannot be used again. When you buy something, consider those__68___(make) from things that can be used again first.
Taking a shower often__69___(need) a lot of water. In one week an American family uses as much water for showers as a person drinks in three years! Buy a waterworks(供水設備) that uses__70___(little) water, or take shorter showers. This can cut the use of water.
【回答】
61 are being polluted 62 factories 63 to help 64 the 65 or 66 off67 that 68 made 69 needs 70
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