List #13

1. happened

2. happening

3. opened

4. opening

5. danced

6. dancing

7. studied

8. studying

9. stopped

10. stopping

11. chased

12. chasing

13. worried

14. worrying

15. dried

16. drying

17. robbed

18. robbing

19. slipped

20. slipping

Challenge:

1. skied

2. skiing

3. argued

4. arguing

5. occurred

6. occurring