在上一次健康警报后，他决定改过自新，戒了烟。

After his last health scare, he decided to ___turn ___over a new leaf and quit smoking.

该公司通过实施更严格的道德准则，已经改弦更张。

The company has ___turned ___over a new leaf by implementing stricter ethical guidelines.

决心要进步，这个年轻人改过自新，采用了严格的学习计划。

Determined to improve, the young man ___turned ___over a new leaf by adopting a strict study routine.