计算：- (-2ax²)²-4ax³·(ax-1)=____．

已知双曲线$\frac{x^2}{a^2}-\frac{y^2}{b^2}=1$（a＞0，b＞0）的左、右焦点分别为F₁，F₂，以F₁F₂为直径的圆与双曲线在第一象限的交点为P．若∠PF₁F₂=30°，则该双曲线的离心率为____ 

根据短文内容和中文提示，写出空白处各单词的正确形式。

    Dreams make life more colorful. ____ (几乎) everyone wants to have a ____ (更好) life. Me, too. I have ____ (数个) dreams. I'm looking forward to ____ (完成)my study and finding a good job. I am ____ (确定)I will enjoy ____ (我) at work. ____(在…期间) the holidays, I will go to the park to help collect ____ (垃圾). I want to do it because I always ____ (担心) about our living place. It's too dirty. I ____ (希望) everybody will do something to make our earth beautiful.