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"Taking steps" in "Modern companies are taking steps to eliminate this mess." (lines 3-4) can be correctly replaced by
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The main purpose of the text is to
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In the sentence of the text “Although commercial refueling stations will be necessary to support a substantial fleet of natural gas vehicles, home refueling may be the magic bullet that makes the vehicles practical” (lines 76-79), the word although implies facts that are
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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
