I happened_______with him when he was hit by a stone.
57. Yesterday I was in the rain on my way back home, and I got a bad could and coughed very badly.
56. The shopkeeper _____ the tramp(流浪汉) stealing sweets from the new supermarket and _____ him.
55. I can’t see John anywhere. Where _____ he have gone?
54. Extensive tests have been on the patient.
53. She_______most of the prizes for swimming.