政治局势一夜之间恶化了。

The political situation ___worsened overnight.

这座城市的空气质量在过去十年里持续恶化。

Air quality in the city has steadily ___worsened over the past decade.

她轻率的言论使原本就紧张的气氛更加恶化。

Her careless remarks ___worsened the already tense atmosphere.