When Joan gave birth【C1】______the first boy in her family in three generations, she and he

r husband were ecstatic.【C2】______were her parents. Joan expected her older sister, Sally, to be just【C3】______delighted. Joan had always worshiped Sally—the beauty and the star of the family—and【C4】______at her achievements. But since the babys arrival, the sisters have become【C5】______Joan feels hurt that Sally seems completely【C6】______in little Andrew. Sally, who had no children, claims that her younger sister "acts【C7】______no one ever had a baby before". Neither Sally nor Joan understands that the sudden【C8】______in their family roles is the real cause of the current【C9】______Joan has finally【C10】______her dominant older sister—and Sally doesnt like it! Their present distance may be【C11】______but study shows that childhood rivalry doesnt just exist during the childhood. It can【C12】______a strong ingredient in sibling (兄弟姐妹) relationships throughout life. In a study at the University of Cincinnati, 65 men and women were asked how they felt【C13】______their brothers and sisters. Nearly 75 percent admitted【C14】______similar feelings. In a few cases, these emotions were sufficiently intense to have【C15】______their entire lives. Many adult brothers and sisters are close, supportive and affectionate—yet still need to【C16】______Two brothers I know【C17】______killers when on opposite sides of a tennis net. Off the【C18】______they are the best of friends. My own younger sister never fails to tell me when Ive【C19】______weight.... However, shes a terrible cook and that【C20】______me.

【C1】

A．to

B．in

C．at

D．for