Everything _____ doing is worthy of _____ well.

Though my grandfather is in his eighties, he is still as _________ as a young man and hates sitting around doing nothing all day.

For most informal dinners，you should wear comfortable，______  clothes. 

Jack has made great achievements in his work, and the harder he works, the more _________ he becomes.

 -Are you feeling _______ now? -Yes, and I feel much happier than ever.