How do you say 'or' in French?

How to reply to bonjour who ever says it first gets a

Only answer if your sure / know what you're talking about! (do not guess)il vend des fruits de mer à é'm pretty sure it's not the first or the second, it's either "fish shop" or "butcher" no idea which.

When she came to my house je mange, je vais manger, je mangeais, je mangerais