Jack ________ have fought with the policeman. —Yes. If one ________ ask for trouble, it can’t be helped.

Donald Trump made a _____ to the nation that he would struggle for lower taxes and improve health care after taking office.

Is this ____ math book – No, it isn’t____ . ____ is over there.

I told them not everybody could run as fast as you did, ________?[ ]

下面文字空缺处需要加上一些虚词，下列选项中的虚词最恰当的一组是（ ）创新的行为要在脚踏实地中稳中求进。因此创新的想象可以海阔天空， ① 一旦付诸实践，就要脚踏实地、严肃认真， ② 稍有不慎，就可能带来较大损失， ③ 在战场上严重失利。创新要坚持稳中求进，要进行充分的科学论证，全面考虑各种主客观因素影响。“稳”是前提，“进”是目的。保持稳妥是为了更好地进取。 ④ 只求稳不求进，就成了“空想家”。