III/ Change these sentences into passive: giải hộ mik vs ạ 83. The president was signig those papers 84. Was Mary helping her mother in the kitchen at that time? 85. The head teacher was making the announcement 86. Someone was cleaning the windows while I was there 87. They were preseting the athletes to the spectators when we came 88. Someone is making the coffee when I walk into the kitchen 89. They have sold their car to pay debts 90. No one has opened the window for ages 91. No one has ever asked me that question before 92.They haven’t done anything since he left 93. A doctor has just examined John 94. They haven’t used this machine for ages 95. Peter has sung this song 96. They have paid doctors a lot of money 97. She has eaten all the ages 98. Famous engineers have designed the aircraft 99. Have several people just seen the accident? 100. We have invited all the members to the party