Spanish HELP find the feminine and masculine

3. la

4. la

6. el

8. el

12. un

13. una

14. un

15. una

16. una

17. un

18. un

19. un

20. una

Explanation:

words in spanish that end with an o sound are usually masculine which could be el (the) or un (a) ; words in spanish that end with an a sound are also usually femenine which could be la (the) or una (a)

3. la

4. la

6. el

8. el

12. un

13. una

14. un

15. una

16. una

17. un

18. un

19. un

20. una

there is no "following"