You should sharpen your skates. Dull blades do not let you skate well. (and OR because)
You should sharpen your skates BECAUSE dull blades do not let you skate well.
Do you want to watch baseball? Do you want to watch a movie? (because OR or)
Do you want to watch baseball OR a movie?
Do you want your hair up in a bun? Do you prefer a French braid? (and OR or)
Do you want your hair up in a bun OR do you prefer a French braid?