If you _____ faults but you still want the bicycle, ask the shop assistant to reduce the price.

依次填入下列各句横线处的成语，最恰当的一组是（ ）① 他是一个心地善良的人，但性格懦弱、谨小慎微，做起事来总是 ，从来不敢越雷池一步。② 当今世界科技突飞猛进，我们更要勇于开拓，不断进取，如果 ，就会落后甚至被时代潮流所淘汰。③ 想让中国传统戏曲焕发出新的生命力，决不能满足于现状， ，唯有创新才是弘扬戏曲文化的康庄大道。

Some of the old beliefs passeddown from one generation to another ________ the present thinking

He had been struggling for many years and finally ________ his fantasies.

Eventually the two sides reached an agreement ___ could not be taken the place of.