2.Diseases are primarily due to (a)   food and air. (contaminate)

3. Over 150,000 tonnes of waste are (a)   annually along the coastline. (dump)

4. (a)   sewage can spread disease and contaminate drinking water sources. (treat)

5. In remote regions, the air is pure and the crops are free of (a)   insecticides. (poison)

6. Some scientists warn that light (a)   damages people and animals. (pollute)

7. Scientists warn that plastic pollution in oceans will be one of the (a)   threats. (big)

8. Water pollution can lead to the (a)   of aquatic plants and animals. (die)

9.If I were the President, I (a)   (ban) billboards in cities in order to reduce visual pollution.

Living near a busy road could cause high blood (a)   . (press)