在婚礼上，他严格遵守社交礼仪，生怕做出任何不合规矩的事。

At the wedding, he strictly followed all the ___proprieties to avoid any inappropriate behavior.

她质疑在正式场合穿牛仔裤的得体性。

She questioned the ___propriety of wearing jeans to a formal event.

在正式场合，我们必须遵守社交礼仪规范。

In formal occasions, we must observe the ___proprieties of social etiquette.