Fossil fuels are used to generate the majority of the world’s energy, and they come in different forms. For example, coal may be burned in a power (25) _________ to generate electricity, but gasoline is burned in a car’s engine to make it run. Neither of these two sources is considered green energy because they produce a lot of pollution when they are burned. In addition, they come from a source that is inevitably going to (26) __________. Green energy can be defined as any energy source that is to some degree non­polluting. When it is called (27) __________, this means that a person can replace the same amount of energy that was consumed by that person (28) __________ that person’s lifetime. Since it took millions and millions of years to create the fossil fuels that we now burn, we know that they cannot be replaced by us. Wind power and solar power, (29) __________ harnessed properly, are two excellent sources of green energy. Once the necessary parts such as wind turbines to generate wind power and solar panels to create solar power have been produced, only the pollution from the production is left. 25. Question 25. A. point B. outlet C. factory D. plant 26. Question 26. A. run out B. run out of C. burn out D. cut out 27. Question 27. A. durable B. sustainable C. harmful D. effective 28. Question 28. A. along B. about C. within D. during 29. Question 29. A. where B. when C. which D. what