别胡闹了，现在是上课时间。

Stop ___goofing around, it's class time now.

他搞砸了演示，因为一直在讲台上胡闹。

He ruined the presentation by ___goofing around on the stage.

别在那傻玩了，我们还有正事要做。

Stop ___goofing around, we have serious work to do.