II. Complete the sentences, using the correct form of the words in brackets. 1. Light pollution make us ...... to see the stars in the sky. (able) 2. Noise is considered as ....... pollution. (environment) 3. The soil becomes ........ because of the use of so many pesticides and fertilizers. (contaminate) 4. ........ waste spills can contaminate groundwater. (industry) 5. ......... habitats have been destroyed in recent years. (nature) 6. A number of cleaning products contain .......... chemicals. (harm) 7. Water samples collected at these villages were seriously ....... with bacteria. (contaminate) 8. People believe that the ....... water has brought cancer to the local residents. (pollute) 9. In many developing countries, water pollution is usually a leading cause of ....... (die) 10. .......... elements have been found in both ground and underground water sources. (pollute) 11. Fish and many other animals are killed by ......... in their habitat. (pollute) 12. Astronomers are concerned about light pollution because they have ........ in viewing activities in the sky and outer space. (difficult)