Some people fear that ________ air pollution may bring about changes in _______ weather around the world.
Du Vigneaud , a well-known American scientist,the Nobel Prize chemistry in 1955.
By the time hethe railway station ,the train.
—Where is Mr Smith? —Hein prison for more than two months.
1. —Haven’t you heard the news? —What news? —Some of the workers are onmarch while others onstrike.
The visiting minister expressed his satisfaction with the talks, _________ that he had enjoyed his stay here.