you should keep it a secret; or you will ruin our plan.

Mum, can I go out to play for a while–No, you can’t, ________ you finish your homework.

I’ll come and see you _____ I go to the countryside

(2014·河南豫北三校联考)________is well known to everyone，I should say，is that a man becomes learned by asking questions

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。