Exercise 3:​Choose the best answer A, B, C or D to complete the sentences. 1.​Solar energy, air and water are _________. ​​A. renewable​​B. limited​​​C. restricted​​D. narrow 2.​Many countries use solar energy _________ their daily life. ​​A. with​​B. into​​​​C. in​​​D. for 3.​_________ is used as fuel in cars, ships and aeroplanes, and even rockets. ​​A. Gas​​B. Oil​​​​C. Coal​​D. Petroleum 4.​It is important for the developed countries to reduce energy _________ as much as possible. ​​A. exhaustion​B. destruction​​C. waste​​D. consumption 5.​Geothermal heat is available only _________ a few places in the world.​​. ​A. at​​​B. on​​​​C. in​​​D. by 6.​Grass _________ animals is a renewable resource.. ​​A. for​​​B. on​​​​C. of​​​D. at 7.​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 8.​People shouldn’t leave litter on land and _________ water.​​. ​A. on​​​B. of​​​​C. under​​D. in 9.​Remember to _________ the lights before going to bed​​. ​A. turn​​B. turn on​​​C. turn off​​D. stop 10.​Our major source _________ energy is oil. ​A. from​​B. of​​​ ​C. in​​​D. for