73. People say that he has just returned from London. → He is had to have 74. "Did you remember to lock the door?" my father asked me. → My father asked me 75. I am sorry I can't go camping with you this weekend. → I wish 76. No- one has challenged his authority before. → This is the first time 77. You'll certainly meet lots of people in your new job. → You are 78. I walked quietly as I didn't want to wake up the baby. → Rather 79. We weren't surprised by his success. → It came 80. The plan may be ingenious, but it will never work in practi