Completar frases C21 REV U3Versión en línea Complete the text with the correct article. por Guadalupe Falcon 1 X the the X the ( 1 ) Energy seems to be on everyone's mind these days . ( 2 ) people are worried because they know that petroleum reserves are not infinite . It's also alarming that ( 3 ) temperature of the earth seems to be rising year by year . Many scientists blame ( 4 ) warming of the earth on ( 5 ) burning of petroleum - based fuels . 2 the X the the X A X However , there is no reason to give up ( 6 ) hope , as ( 7 ) alternatives are available . One example is ( 8 ) wind farm , a collection of wind turbines that turn wind energy into electric power . Another example is ( 9 ) hydroelectric facilities , which change ( 10 ) energy created by moving water into electric power . ( 11 ) hydroelectric facility on ( 12 ) Parana River in Brazil generates about 20 percent of the power used in the country . 3 a X X the a the X X A final example is ( 13 ) solar power . It is one of ( 14 ) cleanest sources of energy and is attracting ( 15 ) attention as well . Many countries , including ( 16 ) United Arab Emirates , ( 17 ) Spain , and ( 18 ) India have built large solar power plants . Lastly , it's important that we all conserve energy . Take ( 19 ) moment to shut off and unplug any electrical items when you leave ( 20 ) room .
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