1. He prefers watching TV … going hiking.

2. He's so sad right now, leave him … and calm down.

3. I have … idea of this project.

4. Just let her … it by herself.

5. I’m fond … playing the piano.

6. They are too busy … us.

7. You had better … your mother about your mistake.

8. He’s bored … doing the same things day by day.

9. I’m fairly good … maths.

10. The police prevent the crowd … approaching nearer.