flustered

突然的掌声让他有点慌张。

The sudden applause ___flustered him a little.

突如其来的掌声让演讲者有些慌乱。

The sudden applause ___flustered the speaker a little.

他突然被点名回答问题，显得有点慌乱。

He got ___flustered when suddenly called on to answer the question.