revert|reverted

如果不持续练习，语言技能可能会迅速退回到低得多的水平。

Without continued practice, language skills can quickly ___revert ___to a much lower level.

短暂尝试新的管理风格后，团队又恢复了他们熟悉的工作方式。

After trying a new management style briefly, the team ___reverted ___to their familiar working methods.

在压力极大的时刻，即使是最文明的人也可能会回归到原始本能。

In moments of great stress, even the most civilised person might ___revert ___to primal instincts.