Just hang the towel ______ the back of the chair so that it will dry soon

What a great artist! It seemed only a couple ofminutes ____ he had finished this wonderful painting!

We all hope to ________ time on the return journey by not stopping at night.

They were ________ busy ________ with each other________ the time.

依次填入下列各句横线处的词语，最恰当的一组是（ ）①要解决我国法律服务市场监管 的问题，就必须完善相关立法，改革法律服务市场的监管体制和工作机制。②曹操高陵的发现， 了古代文献中对曹操高陵的位置、曹操所倡导的薄葬制度等有关记载是确凿可信的。③《全宋诗》的编纂是一项浩大的工程，经过北京大学古典文学研究所的八年多的努力，这项工程终于于日前 。