Most of the energy we use today (26)_______ from coal, oil and gas. But these will not last for ever, and burning them is slowly harming the (27)__________. We need to look for other ways of supplying energy. Solar power is a way of using the (28)_______ energy as heat or sunlight to make electricity. We can also use wind-power by building modern windmills that spin in the wind. There are several types of water-power: river water in mountainous areas can (29)_______ to generate hydroelectric power, and we can also create electricity from sea water flowing in and out with the (30)_______ .

26. Most of the energy we use today (26)_______ from coal, oil and gas. 

A. makes                     B. creates                    C. comes                     D. begins

27. But these will not last for ever, and burning them is slowly harming the (27)__________. 

A. soil              B. atmosphere             C. water                      D. resources

28. Solar power is a way of using the (28)______ energy as heat or sunlight to make electricity. 

A. Sun's                       B. Moon's                    C. Star's                       D. Earth's

29. There are several types of water-power: river water in mountainous areas can (29)_______ to generate hydroelectric power,… 

A. use                          B. using                       C. be used                   D. to use