他一口喝干了这杯。

In one ___gulp, he drained the glass.

他一口吞下整杯水，好像渴了很久。

He ___gulped down the whole glass of water as if he'd been thirsty for days.

听到坏消息时，她紧张地咽了一下口水。

She let out a nervous ___gulp upon hearing the bad news.