135.This kind of analysisthe problem to its simplest form.

65.It is essential that you train tickets as early as possible before the Spring Festival.

64.Had it not been for his carelessness, Davidfirst prize in the mathematics contest.

63.The flowers looked as if theyfor a long time.

62.If the new safety system to use, the accident would never have happened.

61.The student checked his writing carefully lest itsome spelling mistakes.

60.George would certainly have attended the meeting.

59.I＇d rather you make any comment on the issue for the time being.

58.It is imperative that youhere in time.

57.The doctor suggested that hethere.

56.We required that the machine partscast iron.