老师在忘词时不得不即兴发挥。
The teacher had to ___ad-lib when she forgot her lines.
他在演讲中即兴加入的几句幽默话语让全场观众大笑起来。
His funny ___ad-libs during the speech made the whole audience burst into laughter.
歌手忘记歌词时，不得不即兴发挥。
The singer had to ___ad-lib when she forgot the lyrics.
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