他在演讲中插入了几个笑话，让气氛轻松了一些。
He ___interposed a few jokes into his speech to lighten the mood.
她总是忍不住在老师讲课时插嘴提问。
She kept ___interposing with questions while the teacher was lecturing.
老师打断讨论，插入了一个重要提醒。
The teacher ___interposed an important reminder during the discussion.
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