Passive voice answer

4. The fire alarm was tested by the electricians.

5. A new car was bought by my friend.

6. The bathroom was cleaned by John.

7. The blue jeans were invented by Levi Strauss.

8. A new kind of washing powder was developed.

9. The mountains were covered by snow.

10. The keys were given to me by the lady.

Explanation:

I did the first few questions for you to provide some examples. I'm not going to do your all work for you. Good luck!

it wouldnt be considered cheating as long as you dont copy the answered we give here word from word.

also remember that some online schools have things that can tell if you have copy and pasted anything into your report.