Some researches have proved that water quality ____ due to too many dams and pumps in some areas.

your left, you can see a bridge the river.

d to pause from time to time to wipe the sweat from his forehead, because the air—conditioning system ______________.

_________, he is still as modest as before, which always moves all the people who know him.

London was a new world to me and I was find out more about it.