他因处理客户投诉不当而被降职。

He was demoted for ___mishandling customer complaints.

贵重物品在搬运过程中因不当处理而损坏。

The valuable items were damaged due to ___mishandling during the move.

学校对欺凌事件的处理不当引发了家长的强烈抗议。

The school's ___mishandling of the bullying incident caused strong protests from parents.