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47 She was believed to have taken part in revolutionary activities.

48 It's a pity that you didn't tell me about it.

49 If you don't pay tax, you will go to prison.

50 I met him in 1990.

51 No sooner had he written the problem on the blackboard than he solved it.

52 Nothing could be done to help him. 

53 Had he had a driving license, he could have driven his car.

54 My home is the best.

55 My brother is a more careful driver than me.

56 It's not worth trying and getting your money back.

57 I don't want to discuss it with you.

58 I spend 2 years writing the book 

59 I'm excited to see my friends on Sunday.

60 Had he not driven so carelessly, he wouldn't have had an accident.

61 A great harm to your health is done by smoking.

62 He is really successful in his business.

63 Computers are of great use day by day.

64 We are hopeful about our test result.

65 Had the driver in front not stopped suddenly, this accident wouldn't have happened.