（2010年河南改编）在平面直角坐标系中，已知抛物线经过A（-4,0），B（0，-4），C（2,0）三点．则抛物线的解析式为（）

(2011年广西北海改编)如图，抛物线：y＝ax²＋bx＋4与x轴交于点A(－2，0)和B(4，0)、与y轴交于点C．则抛物线的解析式为（）

（2009昌平二模）当时，二次函数的最小值为（）

(2010舟山)已知二次函数，则函数值y的最小值是（）

—Jack, could you help me______ when the plane will take off on the Internet?
—I’m sorry, my computer doesn’t work.

Li Na, a world-famous tennis player from Wuhan, never _______her dream; She has just set a new record in the 2011 French Open.

---When shall we meet again?
---Make it _____ day you like. It’s all the same to me.

______ Tom ______ Mary speaks good Chinese, so they can communicate with these Chinese students very well.

I've just bought five stamps. One is a German stamp,and  ___are American stamps.

After a three hours' long walk, the boys look rather______.