我把那篇文章读了一遍又一遍，直到弄懂为止。

I read the article ___over ___and ___over till it made sense.

我在报纸上翻来覆去地找了好几天，终于发现了一些东西。

I've been searching in newspapers ___over ___and ___over ___again and finally after a couple of days I found something.

他把那首歌练习了一遍又一遍，直到能完美演奏。

He practised the song ___over ___and ___over until he could play it perfectly.