II. Choose A, B, C or D to complete the sentences. 6. If we go on littering, our environment will become seriously________ A. polluting B. polluted C. pollute D. to pollute 7. Many people have had lung cancer because of __________. A. noise pollution B. air traffic C. air pollution D. atmosphere 8. We are talking about the ________ of natural resources. A. preservation B. preserve C. preserving D. preserved 9. There is ___________ clean water because our lakes, rivers and oceans are contaminated. A. less B. much C. more D. fewer 10. If man goes on cutting down more trees, building more roads, and using more land for farming, he ________ his environment. A. are destroying B. would destroy C. will destroy D. destroy