Change the following sentences from active to passive

Change the following sentences from active to passive !

1. They kill elephants for ivory.
   Elephants...........  for ivory.
2. People cut down a lot of trees every year.
   A lot of trees.............  every year.
3. The government will introduce new measures against crime.
   New measures against crime..............  by the government.
4. She offered me a cup of tea.
   I ......... a cup of tea.
5. I didn’t go to the party because they had not invited me.
   I didn’t go to the party because I ........
6. Someone has stolen Michael’s bike.
   Michael’s bike ........
7. Someone should help the old woman across the street.
   The old woman  .......across the street.
8. They are building the bridge at the moment.
   The bridge.......  at the moment.
9. Someone has broken into Anne’s house.
   Anne’s house ........
10. When would you like me to deliver the new bed?
    When would you like the new bed.............  ?
11. Scientists might discover a new cure for cancer.
    A new cure for cancer ........... by scientists.
12. I didn’t leave the restaurant until I had paid the bill.
    I didn’t leave the restaurant until the bill ............
13. Bad weather may delay your flight.
    Your flight .......... because of bad weather.
14. The police might have arrested the burglar.
    The burglar ............ by the police.
15. Workers were setting up a road block when I passed through.
    A road block ........... up when I passed through.
16. The president will give a speech next Monday.
    A speech ............. by the President next Monday.
17. You must repair this car.
    This car ..............
18. They do not allow taking pictures here.
    Taking pictures here ................