她在关键时刻犹豫了，没能及时做出决定。

She ___faltered at the critical moment and failed to make a decision in time.

老人在结冰的人行道上蹒跚而行。

The old man ___faltered on the icy sidewalk.

当她被问到那个尴尬的问题时，她的回答开始变得支支吾吾。

Her answer ___faltered when she was asked that awkward question.