42.Our teacher told (tell) us yesterday that he had visited (visit) England in 1970

43.George has worked (work) at a university so far.

44.When he lived in Manchester, he worked (work) in a bank.

45.Birds build (build) their nests in summer and fly (fly) to the South in winter.

46.I lost (lose) my key. Can (Can) you help me look for it?

47.My father hasn't smoked (not smoke) for 5 years.

48.My teacher wasn't at home when I arrived (arrive). He has just gone (just go) out.

49.How long have Bob and Mary been (be) married?

50.Have You received (receive) any letter from your parents yet?

51.My brother joined (join) the army when he was (be) young.

52. I SAW (see) a car accident while I WAS WAITING (wait) for you on this corner yesterday.

53. Mr.John HAS BEEN (be) principal of our school since last year.

54. Mr.Smith HAS TAUGHT (teach) at this school since he GRADUATED (graduate) in 1980.

55. My father DOESN'T WATCH (not watch) TV every night.

56. I MET (meet) Authur three weeks ago.