you are kidding me．你在和我开玩笑。
I'll just play it by ear．我到时随机应变。 
It makes no difference．没什么区别。 
Just for entertainment．只是为了消遣一下。 
I am so sorry about this. 对此我非常抱歉。
20 divided by 4 equals 5． 20除以4等于5。
You can call me any time．你可以随时打电话给我。 
It's too good to be true! 好得难以置信。
All for one，one for all．我为人人，人人为我。 
East or west，home is best．金窝银窝不如自己的草窝[比心]