Question

most nouns ending with blank are masculine. most nouns ending with blank are feminine.

Answer 1

Most nouns ending in -o are masculine and most nouns ending in -a are feminine.

Answer 2

I don't know how to answer this but maybe. This will help.
If it were a man for example it would be El
If it were a woman it would be Ella
Masculine used in a sentence: A el le gusta la comida.
Feminine used in a sentence: A ella le gusta la comida.
I hope this helped. If you don't feel confident that this is the answer it's fine.