Just as a famous Chinese saying goes, a timely heavy snow is a ______ of good harvest next year.
When it ______ research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.
Would it be ___ for you to pick me up at four o’clock and take me to the airport?
—You speak very good French! —Thanks. I ______ French in Sichuan University for four years.
We should consider _______ use can be made of such a piece of cloth.
—He got his first book published. It turned out to be a bestseller. —When was ________? —______ was in 2000 when he was still in college.