别浪费时间了，专心工作！

Stop ___messing ___about and focus on your work!

老师抱怨学生们不学习，反而在浪费时间。

The teacher complained that students were ___messing ___about instead of studying.

他整个下午都在玩手机浪费时间。

He spent the whole afternoon ___messing ___around with his phone.