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。

Without proper lessons, you could _____ a lot of bad habits when playing the piano.

My birthday is the ninth month of the year. —Oh, it’s ______.

_______ you are busy now, let’s go next time, OK

suggested our going on an outing to thecountryside next weekend, but the rest didn’t sound very _________ about theidea.