1. leghth

2. lengthen

3. width

4. widen

5. childhood

6. famous

7. fame

8. interesting

9. collecting

10. collection

11. collector

12. unlocked

13. beautiful_beautiful

14. unsafe

15. safety

16. unsafety

17. different_ difference

18. action

19. activities

20. inventions_ inventor

21. suitable

Chúc bạn học tốt nhé