顾客对服务不满意，向经理提出了投诉。

The customer made a ___complaint to the manager about the poor service.

她对餐厅服务速度的抱怨得到了经理的重视。

Her ___complaint about the slow service at the restaurant was taken seriously by the manager.

老人向医生诉说膝盖有些不适。

The elderly man mentioned a ___complaint about his knees to the doctor.