别胡闹了，认真听老师讲课！

Stop ___fooling and pay attention to the teacher!

别以为你能用这种小把戏糊弄我。

Don't think you can ___fool me with these little tricks.

别闹了，我们得认真工作，而不是一直开玩笑。

Stop ___fooling around, we need to focus on work.