6.Laughter is one of the most infectiousof emotion.

54.All these dictionaries are a great help to you, ?

53.I don＇t think she has heard of him before, ?

52.Few people know him, ?

51.after the heavy rain.

50.—Bob has made great progress recently.—, and.

49.On no accountto feed the animals.

48.I have nothing to confess. you want me to say?

47.It was the training that he had as a young manmade him such a good engineer.

46.that the pilot couldn＇t fly through it.

45.She had lunch at school yesterday, she?