1. A huge New-Year tree has been decorated in the centre of the square.
2. Our luggage had been taken out before the car arrived.
3. What music is being played?
4. Educational problems are being spoken on.
5. I hope that my letter will have been received by him by Saturday.
6. The dinner has been cooked and the table has been laid.
7. Folk songs were being sung by them.
8. Don’t worry, your children will be looked after.
9. A few New Year’s resolutions have been made by me.
10. The house has not been lived for a long time.  (странное предложение!)
11. The door was opened and he was let in.