Change into the Passive voice

Exercise 2.  Change into the Passive voice.
1. We paint our house every three years.

2. Years ago, people use  oil lamps instead of electric lamps.

3. They’re building several new shools in our town.

4. The boy knew that they were praising him.

5. We have set up a committee to investigate the matter.

6. I noticed that they had not yet taken the wrecked car away.

7. Can we use an Indifinte Article before an uncountable noun?

8. Someone must have dropped this watch in his hurry.

9. They promised the workers higher wages.

10. No one has ever asked me that question before.