摔倒后，他痛苦地呻吟着。

He ___groaned with pain after the fall.

想到又要开一个漫长的会议，她呻吟了一声。

She ___groaned at the thought of another long meeting.

古老的门缓慢打开时发出吱嘎声。

The ancient door ___groaned as it slowly opened.