Помогите переделать из пассива в актив

Replace the following passive constructions with the active ones.
l. dictionaries may not be used at the examination.
2. this copy hasn't been read. the pages were not cut.
3. 3. why wasn't the car locked or put into the garage?
4. i'm not wearing my black shoes today. they are being mended.
5. this room is used only on special occasions.
6. bicycles must not be left in the hall. 7. he was taken to hospital this afternoon, and will be operated on tomorrow morning.
8. the damaged buildings are being reconstructed now, the recon- struction will be finished by the end of the year.
9. she heard footsteps, she thought she was being followed.
10. normally this street is swept every day, but it wasn't swept yes- terday, it wasn't found by the cleaner.
11. thousands of new houses are built every year.
12. the children are very excited this morning. they will be taken to the circus this afternoon.
13. my keys were returned to me yesterday; they had been picked up in the street.
14. the living-room has been swept, mopped and dusted. it is cleaned now. 15. she promised that nothing would be done till his coming.
16. the letter was given to the boss by the secretary.
17. why hasn't the doctor been sent for yet?
18. the fact has been known about for a long time