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.

　　答案与解析：
　　1. So far as I know/As far as I know
　　2. too old to enjoy a Christmas stocking
　　3. They were hardly ever parted
　　4. play important roles
　　5. not to do anything /not to take any action