—Are you _____ with the achievements you have made recently?      —Of course， they show my efforts at least.

Smile is recognized as a/an _________ language, which can be understood by people all over     the world.

It wouldn’t be ________ for us to attend a formal wedding with the sports clothes.

The desks he made are ___ more expensive than these I saw.

The professor was so ______, hardly anyone came to class.