56. When is it sate ____ (cross) the road?

55. She ____ (have) to leave now. Her mum is ill.

54. She often ____ (invite) me to her birthday party.

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.