The blank could be not doing something or choosing to do one thing over another.

空白处可以是没有做过什么事或者选择做了这件事而非另一件。

youdao

They are found doing something they should not be doing.

他们被发现在做不应该做的事情。

youdao

This story tells us that people should not be ignorant of one's strength or doing something beyond one's ability.

这个故事告诉我们，人们不应该无视自己的能力，或者做超出自己能力的事情。

youdao

Some also worry that officers could be sued under the law by people who accuse them of not doing enough enforcement.

VOA: special.2010.07.03

A man who is living in a polis not doing well, how can he be happy? There's just no way.

一个生活在城邦里的人没有做好本分,他怎么会幸福,这是不可能的事情

耶鲁公开课 - 古希腊历史简介课程节选

Until they stop, both of them stop doing that, there is not going to be any peace in Afghnastan.

如果他们两方不停止，阿富汗就不会有和平。

普林斯顿公开课 - 国际座谈会课程节选

Schools which are deemed to be not doing enough to close the attainment gap between rich and poor pupils will have to produce action plans showing how they will spend pupil premium funding.

BBC: Primary schools face tougher targets

There is no reason why Mr. Cordray should not be nominated, and should not be confirmed by the Senate, and should not be doing his job right away in order to carry out his mandate and his mission.

WHITEHOUSE: President Obama Speaks on Confirming Richard Cordray

Some jobs can and have to be run in parallel, but one person should probably not be doing more than one thing literally at the same time, lest quality suffer.

FORBES: Multitasking: Good Or Bad?