Explanation:
te creo, yo también estoy así
Conocen would be the correct answer. I know this personally because im hispanic and speak spanish fluently
There you go, on the last one you have to describe yourself, like jut answer “Estoy alto” if you are tall or “Estoy bajito” if you are short and then add your hair color like brown(cafe), black(negro), etc. Hope it helps
1-Yo soy amigo de Marcos.
2-Marcos y yo somos muy buenos amigos.