Yeah, an angel or a saint or something must protect us new Duolingoers

The exercises are meant to translate as close as possible to the literal. I see them more as an attention tests then a knowledge ones. So:

I eat cheese : eu como queijo

I eat THE cheese: eu como O queijo.

Hope that helps ;)

Yes...it is like you write we eat but you meant I eat.(sorry for mistakes im not from usa or britan:))

You should say "Eu como" (I eat) and "Ele come" (he eats), "Ela come" (she eats) and "Você come" (you eat).