quaver|quavered|quavering

乐谱中这个八分音符需要弹得轻快一些。

Play this ___quaver in the music score lightly and briskly.

当他在众人面前讲话时，他的声音因紧张而颤抖。

His voice ___quavered when he spoke in front of the crowd.

他颤抖的声音透露出内心的紧张。

His ___quavering voice revealed his nervousness.