Children, keep quiet please.

孩子们，请保持安静。

youdao

Could I have quiet please?

请安静。

youdao

Keep quiet, please.

请保持安静。

youdao

I told them to please be quiet or I would punish them.

VOA: special.2009.05.03

Would you please be quiet?

你能安静一点吗？

Would you please 课堂 - SpeakingMax英语口语达人

Music blares between points, spectators come and go from the seats as they wish, and the phrase "quiet, please" is not part of the vernacular.

FORBES: Make Some Noise

So please remain quiet.

BBC: News | NEWSNIGHT | Alison Hoglan interview transcript

Go to church as you please, but in public, keep quiet.

FORBES: Hobby Lobby Fights The Good Fight Against Obamacare Tyranny