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The main purpose of the article is to
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According to the text, extracting oil from the Canadian tar sands
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In "...additional demand for oil could be met by nonconventional methods," (lines 52-53) the verb form could expresses

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"This challenge" in "This challenge will have a longer term effect on our economies..." (lines 43-44) refers to the
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In paragraph 7 (lines 40-50), Sir David King's main comment is that