yawn|yawned|yawning

他在会议期间大声打哈欠。

He ___yawned loudly during the meeting.

没有人打哈欠或感到无聊。

Nobody is ___yawning or feeling bored.

我忍不住打哈欠——我一定累了。

I can't stop ___yawning - I must be tired.