有这样一类题目：将$\sqrt{a\pm 2\sqrt{b}}$化简，如果你能找到两个数m、n，使m²+n²=a并且mn=$\sqrt{b}$，则将a±2$\sqrt{b}$变成m²+n²±2mn=（m±n）²开方，从而使得$\sqrt{a\pm 2\sqrt{b}}$化简．

例如：化简$\sqrt{3+2\sqrt{2}}$．

解：$\sqrt{3+2\sqrt{2}}$=$\sqrt{1+2+2\sqrt{2}}$=$\sqrt{1^2+{\left(\sqrt{2}\right)}^2+2\sqrt{2}}$=$\sqrt{{\left(1+\sqrt{2}\right)}^2}$=1+$\sqrt{2}$

根据上述材料化简下列各式：

（1）$\sqrt{4+2\sqrt{3}}$

（2）$\sqrt{12-6\sqrt{3}}$﹣$\sqrt{16-8\sqrt{3}}$．

下图中所给图形只用平移可以得到的是（　　）

用所给单词的适当形式填空。
①There was an____  (argue) happened between Tom and Jack last night.
②Lucy never ____ (have) a walk after supper every day.
③The people in Iraq keep fighting for their own ____ (free).
④The teenagers have to work hard because of the____  (press) from their parents.
⑤They tried their best to find the____ (solve) because they want to solve the problems.

如图是海洋和陆地之间的水循环运动过程框图，请回答下列问题：

下列物质能共存于同一溶液中，且无色透明的是