61. Traveling around the city in a day is impossible
->it's
62. Is it all right of o take a photograph??
->Would you mind
63.''Shut the door but don't lock it ''she said to us
-> She asked
64 Air travel is faster than any other kinds of transports
->Air travel is the
65. We haven't seen each other for over two years
->The last time
66. I would like you to help me move this table
->Do you mind
67. The water was so cold that the children could not swim in it
->The water was not
68.mai keeps leaving her pen at home
->mai is
69. She is not only a teacher , she is also a singer
->Not only
70. He always borrows my pen
->He is
71. Chirstmas cards shoulf be sent a week before Chirstmas Day
->You
71. ''We are waiting for the school bus '' said the children
->The children said
72.Nobody has used this machine dor years
->this machine
74. Soes can't possibly grow in such poor ground
->It is impossible
75. It is two months since i saw him
->I haven't
76. Tax free goods can be bought before you get on the plane
->You
77. The repaiman is going to repair my car next week
->We are going to have
78.it was such a interesting film that we watch it several times
->the film
79. ''Where are you going next week ''? Ann said to Thanh
->Ann asked
80 We should keep the envinronment clean
-> Th envinronment
Help ^^