Passive voice - active to passive exercise (present perfect).

1) The cleaners have thrown away the papers I left on my desk.

The papers I left on my desk .

2) They have closed the zoo this week for health reasons.

The zoo this week for health reasons.

3) I heard that they have used animals here for scientific experiments.

I heard that animals here for scientific experiments.

4) Somebody has stolen my new watch.

My new watch .

5) The police have not found the murderer yet.

The murderer yet.

6) They still have not solved the case.

The case still .

7) Have you switched the computer on this morning?

Has the computer this morning?

8) Have they done anything about the broken photocopier?

Has about the broken photocopier?

9) People say they have seen her driving a new car.

She driving a new car.

10) Nobody has arranged anything.

Nothing .