fluctuate

他的情绪似乎在一天中起伏不定。

His mood seemed to ___fluctuate throughout the day.

股票价格会根据全球经济新闻而波动。

Stock prices can ___fluctuate based on global economic news.

她的自信水平会根据情况而波动。

Her confidence levels can ___fluctuate depending on the situation.