Answer for me plzz

A,an,a,

1. a 2. a,blank 3. a,a 5. a 6. An 7. An 8. Blank,a 9. A,a 10. A,a . I am not a expert but it could be correct

11. A,an 12. Blank,a,a 13. An,an 14. Blank,blank 15. A 16. A,a 17. An,a,blank 18. A,blank 19.an,blank 20. A,blank . Again i am not a expert but it could be correct okkkkkk !!! If it wasn't don't blame me :?