20. When Jane began to take swimming lessons, her main__________was the fear of water.
Are you willing to live in an age _____ 4G technology will bring about an information revolution?
—Do you know when Jim's coming?—He _____ 9:00 a.m.
—I heard they broke up!—______? They were well-matched in high school.
New traffic rule says: “Whoever drives _____ a red light will be punished severely!”
“What are you busy for?”—This is a question we very often get _____ nowadays.