Shut up!

闭嘴！

He is a smart boy.

他是个小机灵鬼。

How could she possibly ace it when she keeps cutting class all the time?

她老是缺课，怎么能考100分？

He resolved to give up smoking.

他决心戒烟。

That is my idea about friendship.

这是我关于友谊的看法。

Could I have those two tickets, please?

这两张票给我行不行？