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