شرکت در آزمون آنلاین
انگلیسی 3
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درس سوم
| آزمون شماره 11907
We’re trying to raise public awareness about the environment in ......... and air pollution in particular.
We need a lot of equipment and facilities to refine ............................. than other sources of energy.
One of the big problems of the big cities is delaying of emergency vehicles in ............................. the accident.
