Once new difficulties __________ in your work, it's always important to use your brains.
—Mary has caught a bad cold. —Has she? I regret _____ her to put on more clothes yesterday.
At that time, education _____ for white settlers only and few black people had the chance to go to school.
The organization, _____ goal is mainly to improve women’s position in the workplace, was founded in 1996.
It was really _____ of your brother not to play the guitar while you were preparing your lessons.
He made a mistake, but then he corrected the situation _it got worse.