Christmas is coming. Jenny and her family are very happy. They are getting ____ for the festival.

    Jenny is buying some Christmas ____ with her mother. Her father is cleaning the house. He ____ hard. Her grandmother is watching a TV programme about preparing (准备) special ____ What is her grandfather doing? Oh, he is decorating (装饰) a big Christmas ____.

你想知道对方叫什么名字？你可以问：(   )

若${\left(1+x\right)}^3+{\left(1+x\right)}^4+{\left(1+x\right)}^5+\cdots +{\left(1+x\right)}^{2012}=a_0+a_{1}x+a_2{x}^2+\cdots +a_{2012}{x}^{2012}$，则$a_3$等于（）

一带电粒子射入一固定的正点电荷Q的电场中，沿如图所示的虚线由a点经b运动到c，b点离Q最近。若不计重力，则（    ）