Gerund or infinite

1. I want ___ to the gym to keep fit.

2. They must ___ her the truth.

3. Mary would like ___ to the theatre with me tonight.

4. I don't mind ___ with you.

5. Can I ___ you?

6. I don't know where ___.

7. I'm too frightened ___ in an aeroplane.

8. I really think you should ___ at home.

10. I am good at ___ English.

11. He's rich enough ___ a yacht.

12. We would rather ___ to bed early.