When it______ air pollution, Beijing faces the three “C” s-----cars,coal and construction,which lead to Beijing's thick air pollution.
Look!I haven't worn the dress for nearly ten years and it
This kind of music ____ fifty years ago is still popular today
-Where are you exactly? I____to you from a small town about 50 miles away from your city
About an hour after sunrise,I rode across the countryside____birds were singing.
It was very dark,____Jane seemed to know which way to take at the crossroads.