Ex 1: Circle the best answer for each sentence. 1. In order to ____ sunburn, many people wear protecting clothes when they go out. A. continue B. encourage C. facilitate D. avoid 2. We should drink a lot of water to ____ water loss. A. boost B. stimulate C. prevent D. trigger 3. The travel agent wasn't to ____ for the overbooking. A. accuse B. charge C. blame D. claim 4. When I worked as a waiter, the hotel manager found ____ with everything I do. A. blame B. complaint C. fault D. criticism 5. _______ is a kind of energy formed from the remains of dead plants and animals. A. Geothermal B. Nuclear power C. Solar energy D. Fossil fuel 6. There are some hobbies that I indulge _______ for a while. A. on B. at C. in D. with 7. Exhaust ____ from cars are responsible for much of the air pollution in cities. A. fumes B. smokes C. gases D. smog 8. Many factories still allow ____, such as toxic waste, to flow into our rivers A. pollution B. litters C. garbage D. pollutants 9. The greenhouse ____ takes place when certain gases in the atmosphere trap sun's heat. A. emission B. gas C. effect D. affect 10.The roads are terrible. I'm always getting ____ in traffic. A. stuck B. lost C. exhausted D. late 11.Think before print is the slogan to encourage people to save A. forest B. soil C. water D. fossil fuels 12.The government has announced action plans to cut ___ the carbon footprint of both industries and households. A. up to B. down on C. off from D. by up to 13. Methane is also a ___, meaning that its presence in the atmosphere affects the Earth's temperature and climate system. A. infectious disease B. chemical substanceC. greenhouse gas D. scary effect 14.The worst storm, a Category 5, has winds greater than 155 mph and can cause ___ damage. A. potential B. unremarkable C. catastrophic D. strict 15.The ruins evoke the nation's Indian past and legitimizes both Peru's historical ______ and cultural tradition. A. remains B. objects C. heritage D. Cuisine 16. If people stop destroying animals natural habitat, more species will survive and produce _____. A. offsprings B. ecology C. landscape D. benefit 17. Many species of animals are threatened and could easily become ____. A. disappeared B. vanished C. empty D. extinct 7 18. Many animals are ____ for their fur and other valuable parts of their bodies. A. hunted B. chased C. run after D. followed 19. By cutting down trees, we ____ the natural habitat of birds and animals. A. hurt B. would C. damage D. injure 20. ____ arent effective anymore because insects have become resistant to them. A. Fertilizer B. Pesticides C. Herbicides D. Composts 21. Air pollution is such a serious ___ that it has been a direct factor in the ___ of millions of people each year. A. threaten death B.threaten- deaths C.threat deathD.threat deaths 22. Non-renewable energy sources are running ____, and well soon have no other choice but switching ___ alternative sources. A. up/off B. on/of C. to/on D. out/to 23. We get the energy we require for our everyday needs from many sources, but not all of them are ___. A. unharmed B. eco-friendly C. ecological D. economic 24. The National Park is open to all visitors who undertake _________ the rules. A. to obey B. to break C. to violate D. to consider 25. Large areas of national parks also experienced _________ fires. A. maintaining B. preserving C. devastating D. building 26. Today, many governments have taken into consideration the _________ of water resources. A. conversation B. conservation C. conservatism D. conservative 27. The flight stops at Hong Kong before going on to its final _________. A. destination B. target C. stop D. arrival 28. You can climb up Mount McKinley, the highest peak in North America, to explore the rest of Denali National Park in Alaska, and view some _________ wildlife. A. excited B. great C. interested D. spectacular 29. Villagers can compete against the commercial fishing and timber companies who _________ the natural resources of the area, taking as much as they want. A. leave B. decrease C. deplete D. lower 30. The ___________ loss of land is the result of severe deforestation. A. large B. recessive C. massive D. sprawling