Although there were so many people in the square, I could ______ my friend.
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.
52. Don’t worry. Your child is old enough to___________himself.