European football is played in about 80 countries, ____ (make) it the most popular sport in the world.
抗日英雄群体____，在完成掩护任务后纵身跳下悬崖。
已知p：关于x的不等式x2+2ax+4>0对一切 x∈R 恒成立；q：函数f(x)=-(5-2a)x在R上是减函数.若“p或q”为真，“p且q”为假，求实数a的取值范围（ ）。
旅游途中，小雄同学在超市买了一瓶矿泉水，商标上注有：冀卫食证字【2004】第字样，于是他断定矿泉水注册于（ ）
What great means! How did you manage to find ? It is the first time I such wonderful means.
—Sorry, Sir. I can't remember all the new words we learn every day.
—________. Practice more.
