Инфинитив или герундий. Урок английского языка

1. They enjoy cycleto cyclecycling.

2. I am interested in learnto learnlearning karate.

3. His jokes made us laughto laughlaughing.

4. Why should they doto dodoing this?

5. My frineds encouraged me applyto applyapplying for this job.

6. I didn't mean hurtto hurthurting your feelings.

7. He refused betrayto betraybetraying his friends.

8. What about eatto eateating out tonight?

9. Do you mind opento openopening the window?

10. Let them goto gogoing.