Using passive voice:We must put an end to this state of things as soon as possible.
【正确答案】正确答案：This state of things must be put an end to as soon as possible．
【答案解析】解析：要求使用被动态。将宾语this state of things提前，然后依次添加情态动词must、be动词和-ed分词及句子的其他成分。