她整晚只喝水，所以一直很清醒。

She only drank water all night, so she stayed ___sober.

在会议上，他保持着冷静严肃的态度。

He maintained a ___sober demeanor during the meeting.

她选择了一件色调沉稳的灰色大衣参加正式会议。

She chose a ___sober gray coat for the formal meeting.

他的警告让欢快的气氛顿时变得严肃起来。

His warning ___sobered the cheerful atmosphere immediately.