孩子们跟着音乐的节奏开心地唱着“嘟嘟嘟嘟”。

The children happily sang along to the ___do-do-do-do rhythm of the music.

她在演讲时紧张得一直说"呃呃呃呃"来填补停顿。

She nervously said ___do-do-do-do during her speech to fill the pauses.