Comparative and superlative

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

Don is the ......... guy I know!

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

This subject is ......... than the last one we studied.

It was rainy and cloudy yesterday. However, the weather is ......... today.

This book is ......... than the last one I read.

Richard is pretty high-strung. However, his brother is much ......... in comparison.

This is the happiest moment ......... my life.

Mike is ..... than Fred.

This subject is ..... than the last one we studied.