她起初对这个提议犹豫不决，但最终还是同意了。

She ___balked at the suggestion at first, but eventually agreed.

那匹马突然在栅栏前停下，不肯跳过去。

The horse ___balked at the fence and refused to jump.

恶劣天气成为了我们户外活动的主要障碍。

The bad weather was the main ___obstacle to our outdoor activity.