Fill in the correct preposition

1. He always behaves [ ] such a silly way that nobody respects him.

2. I was wrong [ ] the time; the class starts at 9 am not 8 am.

3. The doctor can only be seen [ ] appointment.

4. After losing everything they had, they had to start [ ] scratch.

5. A lot of important discoveries happen [ ] chance.

6. Scientists are currently conducting research [ ] the possible causes of the disease.

7. After confessing to his crime, he was sentenced [ ] life imprisonment.

8. Everyone was shocked [ ] the tragic news.

9. I can't find a solution [ ] this problem.

10. You can't rely [ ] him because he never keeps his word.