—Why did you get such a low mark on that test?—It’s mainly because I seldom _______ the teacher’s advice, I think.
He is a man of few words, and seldom speaks until _____ to.
They kept trying _____ they must have known it was hopeless.
There are five pairs, but I'm at a loss which _____ to buy.
He was not an actor, who often appeared on stage, _____ a writer, writing stories.
Please make my excuse at tomorrow's meeting. I've got too much work _____.