The sky over big cities is f_____ with smoke because of car

The sky over big cities is f_____ with smoke because of car In many big cities of the world,the overuse of cars is thoug The car is one of the ____ (direct)over there. The car is one of the ____ (busy)over there. In the poor parts of America's big cities there is a lot of 英语翻译In many big cities in the world,the overuse of cars is t London‘s nickname is“The Big Smoke”中,“The Big F_____ is the second month of year. Chairman Mao is the f_____ of China. paris is the capital of F_____ In some big cities,little is done to make smoke clean before In some big cities,is done to make smoke clean before it goe