stutter|stuttered|stuttering

他紧张得结结巴巴，连自己的名字都说不清楚。

He was so nervous that he could only ___stutter his name.

他在面试时紧张得说话结结巴巴。

He ___stuttered nervously during the interview.

音乐播放时断时续，听起来很不流畅。

The music kept ___stuttering and didn't play smoothly.