1. Many rare animals disappear because the loss of ____ makes it impossible for them to survive. 2. If we don’t stop air, water, and ____, future generations will have problems finding clean drinking water and fresh air. 3. The smoke from the ____ covered the sky with dark clouds, making it difficult to see the sun. 4. After years of dumping factory ____ into the lake, the water became so toxic that no fish could survive. 5. Scientists say that ____ clouds can cause serious breathing problems in big cities. 6. When fish and ____ start dying, the whole ecosystem is in danger. 7. The toxic ____ from cars and factories make the air in large cities unhealthy to breathe. 8. ____ destroyed the leaves on the trees and left ugly marks on the old buildings.

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