who knows! 天晓得！

it is not a big deal! 没什么了不起！

how come… 怎么回事，怎么搞的。

it is urgent. 有急事。

what is the fuss？ 吵什么？

still up？ 还没睡呀？

it doesn't make any differences. 没关系。

don't let me down. 别让我失望。

hope so. 希望如此。

go down to business. 言归正传。

none of my business. 不关我事。

it doesn't work. 不管用。

i'm not going. 我不去了。
　　
does it serve your purpose？ 对你有用吗？

i don't care. 我不在乎。

not so bad. 不错。

no way! 不可能！

it is a long story. 一言难尽。