当我提到他的名字时，她皱起了眉头。

She ___frowned when I mentioned his name.

她看着他并皱起眉头，奇怪的是，他却回以微笑。

She looked at him and ___frowned, strange, but he smiled back.

他对着吵闹的孩子们皱起眉头表示不赞同。

He ___frowned in disapproval at the noisy children.