Answer:
assuming you don't mean the world wonders...
three knows:
i know a math formula (depending on whatever grade you're in)
i know the difference between your and you're
i know that global warming is affecting our planet
the three knows can really be whatever you know!
three wonders:
i wonder what would happen if aliens invaded earth
i wonder what would happen if all flowers turned the same colour
i wonder what would happen if everyone's phones exploded
etc!!