You’d sound a lot more polite if you make a request ______ a question.
I don’t know the girl _____ in the storm.
— I regret _______ you that you failed the exam. — How I regret _______ so much time playing computer games.
It’s hard to finish the work in a day. You’d better ____ your friends to help you.
There are two buildings, _______ stands nearly a hundred feet high.
The court hears about 120 cases a year; visitors are welcome to see a case ______.