他降低了音量以免打扰邻居。

He ___lowers the volume to avoid disturbing the neighbors.

医生建议他降低胆固醇水平。

The doctor advised him to ___lower his cholesterol level.

老师降低了音量以便学生们能听清楚。

The teacher ___lowers her voice so the students can hear clearly.

他不愿降低身份去参与这种无聊的争论。

He wouldn't ___lower himself by joining such silly arguments.