Exercise 2: Choose A, B, c or D that best completes the sentences or substitutes for the underlined word or phrase. 6. _____energy is produced from the heat stored in the earth’s core. A. Water B. Solar C. Nuclear D. Geothermal 7. Oil, coal, and natural gas are_____ fuels made from decayed material from animal or plants. A. fossil B. solid C. smokeless D. unleaded 8. Many newer cars have a much lower fuel_____ A. consumer B. consuming C. consummation D. consumption 9. We should develop such_____ sources of energy as solar energy and nuclear energy. A. tradition B. alternative C. surprising D. limited 10. Increased consumption will lead to faster _____of our natural resources. A. exhaust B. exhausting C. exhaustion D. exhaustive 11. He has carried out extensive research _____renewable energy sources. A. into B. in C. about D. at 12. People should stop cutting trees_____ timber. A. with B. into C. for D. in 13. Solar panels_____ the roofs of houses can create enough energy to heat or cool an entire house. A. at B. on C. for D. in 14. We are trying to find solutions_____ the environment pollution. A. to B. from C. after D. for 15. People shouldn’t leave litter on land and_____ water. A. on B. of C. under D. in