comparative of adverbs

They smiled (happily) (a)   than before .

Tom arrived (early) (a)   than I expected .

We will meet (late) (a)   in the afternoon .

We walked (slowly) (a)   than other people.

I can throw the ball(far) (a)   than anyone else in my team.

James drives(carefully)  (a)   than his wife.

 No one can run (fast) (a)   than John.

Everyone in the company is working  (hard) (a)   than ever before.

My sister cooks (badly) (a)   than I.

I speak English (fluently) (a)   now than last year.