从方框中选择适当的单词完成短文。

   What's this on the table? It is a ____  of my new classroom. ____  at the picture. ____  can you see ____  the classroom? I can see a ____  desk in the front of the classroom. Some books are ____  the desk. I can see two white ____ , too. There are____  colored chalks (彩色粉笔n them. ____  is the broom (扫帚)? It’s ____  the door. I like this new classroom.

按要求写句子。

①从这以后，楚王不敢不尊重晏子了。(改成肯定句)

②淮南的橘树一种到淮北，就只能结又小又苦的枳，还不是因为水土不同吗？(改成陈述句)

③楚王仗着自己国事强胜，想乘机侮辱晏子。(修改病句)

④楚国的大臣们听了，都得意扬扬地笑起来，以为这一下可让晏子丢尽脸了。(用划线词造句)

设全集$U=\left\{x\in N|x\le 5\right\},A=\left\{1,2,3\right\},B=\left\{1,4\right\}$，则$\left(C_{U}A\right)\cap \left(C_{U}B\right)$=(    )

下列多项式中不能用平方差公式分解的是（      ）