There is no doubt ______ international cooperation is key to ______ with cybercrime, as Vinton Cerf has said that the problem of cybercrime is _______ huge that it requires UN to form a special agency to act as an international referee or steward.

地球是一个____的不规则的球体．

如图，在平面直角坐标系xOy中，椭圆E： $\frac{x^2}{a^2}+\frac{y^2}{b^2}$ =1（a＞b＞0）的左、右焦点分别为F₁，F₂，离心率为 $\frac{1}{2}$ ，两准线之间的距离为8．点P在椭圆E上，且位于第一象限，过点F₁作直线PF₁的垂线l₁，过点F₂作直线PF₂的垂线l₂．

（Ⅰ）求椭圆E的标准方程；

（Ⅱ）若直线l₁，l₂的交点Q在椭圆E上，求点P的坐标．

It took us three years         the bridge    

数列中第10项是                         （  ）