شرکت در آزمون آنلاین
انگلیسی 3
-
درس سوم
| آزمون شماره 1688
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.
One of the big problems of the big cities is delaying of emergency vehicles in ............................. the accident.