41. stayed - rode - had borrowed
42. told - had visited
43. has worked
44. worked
45. build - fly
46. have lost
47. hasn't smoked
48. arrived - had just gone
49. have Bob and Mary been
50. Have you received
51. joined - was
52. saw - was waiting
53. has been
54. has taught - graduated
55. doesn't watch
56. met
#CÂU NÀY KO COPY NHA# MIK LM TỪ TRC RÙI NÊN BT