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Land pollution is responsible for damage done ___ natural habitat of animals.

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Americans throw ___ twenty-eight and a half million tons of plastic in landfills every year.

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Scientists have come up ___ new ways of saving energy.

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Thousands of people were exposed ___ radiation when the nuclear plant exploded.

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Waste water from many factories which is dumped ___ water bodies directly causes pollution.

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___ fumes from these vehicles are serious air pollutants.

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___ thermal pollution happens, the water temperature in streams, rivers, lakes, or oceans changes.

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Air pollution occurs when the atmosphere contains gases, dust, or fumes in ___ an amount.

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When radiation goes into the land, air, or water, it is called radioactive ___.

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Too much use of electric lights in cities may ______ light pollution.

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If the temperature ____ rising, the polar ice caps will melt.

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Because of ____ pollution, the bicycle may someday replace the automobile.

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Students should learn some practical ways that help to ____ pollution.

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____ she left the party, Jenny said goodbye to the host.

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People think that global warming ____ lots of problems in the future.

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We saw many beautiful birds while we ____ in the lake.

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The train arrived while/ as soon as Elie was having lunch.

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Because/ Although the water is very cold in January, they go swimming anyway.

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My father goes jogging every morning before/ after he gets ready for work.

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I learned a lot about wildlife until/ after I visited Cuc Phuong National Park yesterday.