waffle|waffled|waffles|waffling

老师让他解释这个问题，他却在那里东拉西扯说了一大堆无关的话。

When the teacher asked him to explain the problem, he just ___waffled on about unrelated things.

每次问他周末计划时，他总是含糊其辞。

He always ___waffles when asked about his weekend plans.

她一直在买还是不买之间犹豫不决。

She kept ___waffling between buying it or not.