Answer:
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
Step-by-step 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)