61.John () to be a polite man. But in fact he is very rude.

51.As a teacher, you should not () the students from asking questions in class.

50.The computer has brought about surprising technological changes () we organize and produce information.

49.This is the nurse who () to me when I was ill in hospital.

48.He was such a () speaker that he held our attention every minute of the three-hour lecture.

47.Although he had looked through all the reference material on the subject, he still found it hard to understand this point and her explanation only () to his confusion.

46.In the Chinese household, grandparents and other relative play () roles in raising children.

45.Though () in a big city, Peter always prefers to paint the primitive scenes of country life.

44.I’m very sorry to have () you with so many questions on such an occasion.

43.Our hopes () and fell in the same instant.

42.The manager promised to keep me () of how our business was going on.