1. The room was cleaned and aired. - Olga cleaned and aired the room.
2. Have all these books been read? - Have you read all these books?
3. Whom were these letters written by? - To whom has he written these letters?
4. The letter has just been typed. - Mike has just typed the letter.
5. She showed me the picture which had been painted by her husband. - She showed me the picture which her husband had painted.
6. I shall not be allowed to go there. - They will not allow me to go there.
7. He has been told everything, so he knows what to do now. - They have told him everything, so he knows what to do now.
8. All the questions must be answered. - We must answer all the questions.
9. The door has been left open. - They have left the door open.
10. When will these books be returned to the library? - When will you return these books to the library?