Comparative and superlative

I think Chelsea is ......... now than she was three years ago.

Melanie is the ......... girl in our class.

Thomas is ......... than his girlfriend.

Meg is the ......... person I know. She's a very positive person.

This is the ......... road I've ever seen!

Turtles are .........; however, rabbits are fast.

I think Mount Everest is the highest mountain ......... the world.

Mike is ..... than Fred.

Melanie is the ..... girl in our class.

You have to be ..... careful when working with power tools.