fluster|flustered

突如其来的演讲让他在台上显得慌乱不已。

The sudden speech left him in a ___fluster on stage.

突如其来的掌声让他一下子慌了神。

The unexpected applause ___flustered him completely.

他在重要面试前总是紧张得手忙脚乱。

He always gets into a ___fluster before important interviews.