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According to the 9th paragraph in the text (lines 65-75), refueling stations in the United States
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The personal pronoun it in “so if it is burned in an engine designed to run on conventional fuel” (lines 55-56) refers to
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According to the 6th paragraph in the text (lines 43-52), one of the Corporate Average Fuel Economy goals for the fleet in the United States is average 54.5 miles per gallon
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The modal verb may in the fragment of the text “It may be years before the economic benefits of natural gas vehicles can be realized” (lines 35-36) is associated with the idea of
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In the 5th paragraph, limited by lines 35-42 in the text, the author defends the idea that