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More recently, oil has been more difficult to find, as it is hidden deep beneath the earth under many (a)   of solid rock.

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There have even been oil (a)   , and we have had to wait in long lines and pay high prices for gasoline.

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A serious (a)   of oil, coal, and similar fuels is the pollution they create around our cities.

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Countries and companies are (a)   alternative

energy.

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They are looking for energy sources that are (a)   and can never be used up.

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These alternative energies follow the (a)   that energy production should be sustainable, not temporary.

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People are showing a lot of (a)   for new energy technologies such as wind and hydroelectric power.

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Government (a)   in the form of money or tax breaks have helped convince some companies to develop alternative energy technologies.

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Experts think that in the future the world will (a)   alternative energy for a larger percentage of its total energy needs.

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present or existing in large quantities

(a)  

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the feeling of being very interested in or excited about

something

(a)  

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things that encourage you to want to work hard or take action

(a)  

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pieces of a material or substance that cover a surface or are between two other things

(a)  

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making an effort to achieve a goal

(a)  

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a factor which makes a person or a thing less useful or

successful than other people or things

(a)  

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a general belief about the way something should behave

(a)  

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to use

(a)  

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resources that are natural and always available, such as

wind and sunlight

(a)  

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conditions in which there is not enough of something

(a)