已知集合$M=\left\{x|\left|x-7\right|<9\right\}$，$N=\left\{x|y=\sqrt{9-x^2}\right\}$，且$M,N$都是全集$U$的子集，则右图中阴影部分表示的集合是        （   ） 

选词填空。

    Song Xiong is my Mend．He is strong．His____are long and his feet are big．He likes running．Sometimes we____together．

Song Xiong studies in a big school．There are several foreign teachers．They speak English．One of____is Henry．He always talks with students with a____．Song Xiong learns much from him．Last Saturday,Song Xiong had a birthday party．Henry____a book for him.Song Xiong was very happy．

—        I went there with my parents.