我不再喝酒了——我已经改过自新了。

I'm not drinking any more - I've ___turned ___over ___a ___new ___leaf.

她承诺要改过自新。

She promised to ___turn ___over ___a ___new ___leaf.

争吵过后，他决定改过自新，变得更加体贴。

After the argument, he decided to ___turn ___over ___a ___new ___leaf and be more considerate.