我会遵守承诺。

Wǒ huì zūnshǒu chéngnuò.

I will respect our agreement.

请大家遵守交通规则。

Qǐng dàjiā zūnshǒu jiāotōng guīzé.

Everyone please comply with traffic regulations.

同学们，请遵守秩序。

Tóngxuémen, qǐng zūnshǒu zhìxù.

Classmates, please follow the order.