不同身份有不同责任，不同责任具有相同来源。（   ）

  ____  ____  ____ = ____

“有话好好说”是一种艺术，也是一种修养，有时候我们不经意间的一句话可能很伤父母心。以下是一些同学经常对父母说的话，其中能体现“有话好好说”的是______。（    ）

设$U=R,P=\left\{x|x>1\right\},Q=\left\{x|x\left(x-2\right)<0\right\}$则$C_U^{\left(P\cup Q\right)}=$（　　）

请阅读Tony从美国发来的电子邮件，以李华的名义写一篇80词左右的回复。文中不得出现真实的人名、校名与地名。

Hey Li Hua

How are you? I've been busy since I came back from China. Guess what! I'm learning Chinese very hard, but I find it really difficult to learn Chinese well. Please tell me the best way you think.

One more thing, I hear you have Mid-Autumn Festival in China. What's the date of the festival? How do you celebrate?

Tony