1.___________________(据我所知),this is the first time a Chinese rider has won the competition.
　　2.You are never________________(老到不能获得圣诞长袜所带来的快乐)
　　3._____________________(他们几乎从来没有分开过) in thirty years of marriage.
　　4.In the Chinese household, grandparents and other relatives__________________(起着重要的作用)in raising children.
　　5.Frankly speaking, I’d rather you__________________(不采用任何措施)about it for the time being.
　　

　　答案：
　　1. So far as I know/As far as I know
　　(本题考查固定用法so/as as sb knows, 据某人所知)
　　2. too old to enjoy a Christmas stocking
　　(本题考查too…to…的句型，表示“太…以至于不能…”，还考查enjoy一词的用法，enjoy sth 表示“享受某事带来的乐趣”)
　　3. They were hardly ever parted
　　(本题主要考查否定词hardly考试365意为“几乎从来没有”，由于它没有置于句首，句子用正常语序即可，be parted 意为“分开”)
　　4. play important roles
　　(本题考查“play a part/role in doing sth”结构，表示“起着…作用，饰演…的角色”)
　　5. not to do anything /not to take any action
　　("would rather ”的否定形式是would rather not to do ,would rather 没有人称和数的变化。“采取措施”可译为"do something”或"take some action”)