What is the comparative form of great?

Which comparative adjective is NOT spelled correctly?

Which word goes in the space?   

My wife is more intelligent ___ me.

Which sentence is NOT correct?

Who's ............... person in your family?

Alejandro is .................... student in the class.

Football is ....................... sport in the world.

Pacific ocean is .................. ocean in the world.

Roller coaster is .............................. ride at the funfair

That's ................. cake that I've ever eaten in my life.