员工对政策的突然变化提出了抗议。

The staff ___protested about the sudden change in policy.

工人们就危险的工作条件向管理层提出了抗议。

The workers ___protested to management about the unsafe conditions.

缓慢的服务导致许多顾客投诉。

Slow service caused many customers to ___protest.