Lawrence Craven, a doctor from the USA, is the author of several published reports, one of _______ introduced the idea in 1953 _______ aspirin could reduce the risk of heart attacks.
We should try our best to leave our generation a world better than________we were given.
—Can you accompany your little brother to the post office now? —________,if he is ready.
As everybody knows,kangaroos are native________Australia and are often regarded as one of Australia’s national treasures.
There is________as a free dinner in this world.As the saying goes,“No pains,no gains.”
Linda’s health is improving________day by day,and the doctor has advised her to stay home for a couple of weeks.