After two years’ research, we now have a __________ better understanding of the disease. 

He got seriously ill. Later he couldn’t see anything at all --- he was ________ blind.

Recent studies have discovered that fathers uniquely contribute to the development of their children, _____ in low income families.

—What do you think of the speech?     —The speaker said ___ nothing worth ___

The poor boy couldn't work the problem out. He wasn't ____ clever.