如果|ab-2|+|b-1|=0，求式子的值为（）．

（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______.

The new kind of car is _____ dear, and I don’t have _____ money.