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10.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 andfertilizers. (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 tothe 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)

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