将下列词语依次填如句子的横线处，排序恰当的一项是（ ）①迂回曲折 ②平淡无奇 ③幽深险峻 ④雄伟壮观 ⑤平坦开阔生活有如 的画廊，一下是 的峡谷，一下是 的原野，谁知当我埋怨兰州 的黄河的时候，就在离兰州不远的地方，黄河向我显示了 的景象，这就是刘家峡。

He was always _______ for knowledge, and at last became an expert in the field of art.

－I’d like you to tell me something about Shennongjia.－I’m sorry, but neither Jack nor I there.

The meal over, the managers went back to the meeting room to _____ their discussion.

The professor could hardly find sufficient grounds_____his arguments in favor of the new theory.