设$x,y\in R$，向量$\overrightarrow{a}=\left(x,1\right),\overrightarrow{b}=\left(1,y\right),\overrightarrow{c}=\left(2,-4\right)$且$\overrightarrow{a}\perp \overrightarrow{c},\overrightarrow{b}\parallel \overrightarrow{c}$，则$\left|\overrightarrow{a}+\overrightarrow{b}\right|=$ (     )

   My hobby is table tennis.____  table tennis is an energetic activity. I know it isn’t very ____ .but I find it very interesting .I am good at table tennis and I enjoy my____  when I win a game. In my free time, I like reading. I like to sit down with a book. When I read, I ____ what’s____ ,and how the people feel.

西北地区农作物生长最缺乏的条件是（　　）

补充词语。

一____小爪子         一____眼睛       一____ 嘴        一____翠鸟

____的水面         ____的眼睛      ____的羽毛       陡峭的____