The science of computer, _____rapid progress has been made in recent years, is the most important of all science.
In dealing with public relations,we should make every effort to prevent the __________ in personality.
We __________ Mr.Cox to be a fine professor.
At the __________ of the gun,the runners dashed from their starting points.
Mr.Smith used to smoke __________ but he has given it up.
She not only entered the competitionshe __________ won it.