Well, I really don’t know what you mean, ______ you want me to do?
She felt _____ of having asked such a silly question when the audience couldn't help laughing.
After a short holiday, he _____ himself once more to his studies.
The family is a cooperative enterprise for which it is difficult to _____ rules, because each family needs to work out its own ways to deal with its own problems.
Keys should never be hidden around the house since thieves _____ know where to look.