There are many kinds of pollution. Air, water, and land can be (1) _________________. Some pollution is caused by nature, such as floods, forest fires, and volcanoes. People are the major cause of pollution. We pollute the air with our cars, homes, and factories. We pollute the water (2) _________________ dumping garbage and chemicals in the water. We pollute the soil with chemicals and garbage. We harm the land by cutting (3) _________________ trees in the forest, especially to build roads and new houses without careful planning and thinking.

All people need water to drink and to make plants grow. Rivers and lakes are polluted when sewage or garbage is dumped (4) _________________ the water. Plants and animals die (5) _________________ the pollution in the water. Other pollution in water is caused by oil spills. The oil often stays on top of the water. It covers the beaches and land. It gets on the fish, birds, and animals that live in, on, and around the water.

1. A. pollutedB. pollutionC. pollutantD. pollute
2. A. withB. forC.byD. of
3. A. upB. inC. onD. down
4. A. ontoB. intoC. onD. in
5. A. becauseB. althoughC. because ofD. despite