对于函数y=（m-2）x+m+2，当m=______时，它是正比例函数；当m______时，它是一次函数．

翻译以下单词和短语并完成句子。

1. surrounding adj. ______

2. surroundings n. ( pl. ) ______

3. be surrounded with/by..._____

4. in a surrounding area_____

5. be situated/located in very pleasant surroundings_____

6. The Sichuan Basin____three sides on high mountains.

     四川盆地三面都是高山.

7.  The peasants are allowed to cultivate___.

     允许农民耕种周围的土地.

8.  Animals in a zoo are not living in ____.

    动物园里的动物们不是生活在自然环境之中.