شرکت در آزمون آنلاین
انگلیسی 3
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درس سوم
| آزمون شماره 1688
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One of the big problems of the big cities is delaying of emergency vehicles in ............................. the accident.
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4- The majority of health experts are concerned about the air pollution and global warming. They suggest that cars burning fossil fuels have ......... by electric cars as soon as possible.
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