II. Choose A, B, c or D that best completes the sentences or substitutes for the underlined word or phrase. 6. Solar energy, air and water are_______. A. renewable B. limited C. restricted D. narrow 7. Although nuclear power is clean and plentiful, it is not_______ A. dangerous B. unsafe C. safe D. renewed 8. _______energy sources include water and wind power. A. Friendly environmental B. Environmentally friendly C. Friendly environment D. Environmental friendly 9. Solar energy can be changed into_______. A. electricity B. electric C. electrician D. electrical 10. Hydroelectric power is produced by the fall of_______ trapped into a dam. A. air B. soil C. wind D. water 11. Our major source _______energy is oil. A. from B. of C. in D. for 12. The amount of fossil fuels_______the world is limited. A. on B. for C. of D. in 13. What do you need energy_______? A. to B. for C. at D. by 14. When water moves _______a high place to a lower place, it makes energy. A. with B. on C. from D. at 15. Many countries use solar energy_______ their daily life. A. with B. into C. in D. for