53. He ____ (begin) to teach in our school about ten years ago.

52. We are too tired .let´stop ____ (have) a good rest.

51. Mrs. Green hates ____ (travel) by air.

50. We found it was very difficult ____ (get) a car.

49. It ____ (be) five years since he ____ (buy) the motorbike.

48. His father ____ (read) newspaper when I got there.

47. I ____ (want) to buy a new coat next Sunday.

46. Mr. Green ____ (leave) his notebook at home yesterday.

45. Sorry, when you ____ (call) me, I ____ (think) and ____ (not hear) you.

44. When I ____ (go) to see Tom, he ____(not write) anything.