他在街头用小提琴演奏了一首优美的曲子。

He ___fiddled a beautiful melody on his violin at the street corner.

她在等待结果时不停地摆弄她的头发。

She kept ___fiddling with her hair while waiting for the results.

他因为篡改考试成绩被学校开除了。

He was expelled from school for ___fiddling with the exam results.