شرکت در آزمون آنلاین انگلیسی 3 - درس سوم | آزمون شماره 7017
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2- Which sentence is grammatically wrong?
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The campers will walk around the forest until they ............................... enough firewood to start a huge flame to keep them warm tonight .
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We need a lot of equipment and facilities to refine ............................. than other sources of energy.
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Most of the famous and valuable paintings have been bought by private ...................... .