Fill in the correct preposition

1. Is the surgeon going to operate [ ] her leg tomorrow?

2. Most students object [ ] wearing school uniforms.

3. I mistook you [ ] Pamela – you look alike.

4. The candidate made a good impression [ ] the voters with his speech.

5. He was expelled [ ] school for fighting with another student.

6. She is totally unaware [ ] the risks involved in rock climbing.

7. He qualified [ ] a doctor five years ago.

8. She studied law and specialises [ ] criminal cases.

9. Nobody expected her to pass her exams so they were all surprised [ ] the good news.

10. Going to the gym every day was difficult but the exercise was beneficial [ ] the long run.