He has been told many times that his casual clothes are not ____ for some formal occasions．

--Lily did succeed at last! --Yeah, indeed, but she was ________ than successful, I think．

Children, who grow up in a friendly family, are more ______ to get along well with others. 

The change was so _____ that we hardly noticed it.

The college entrance exam is ____ important to the student, and it’s also challenging.