I am trying to do what is best, but ______ I’ve got to consider the cost, which is of great importance.
A person who has never tasted bitter won’t know ______ sweet is.
--- The professor gave a really good speech. --- I suggest you ______ him some specific questions about his work experience.
The agent promised to keep the family members fully ______ of any developments.
It was unusual that such close neighbors ______ not know one another.
It’s always hard to remember a name when one doesn’t have a face to go with ______.