fluctuate|fluctuated

她的自信水平会根据情况而波动。

Her confidence levels can ___fluctuate depending on the situation.

近几个月来，石油价格波动剧烈。

The price of oil has ___fluctuated wildly in recent months.

该产品的需求往往会随着季节变化而波动。

Demand for the product tends to ___fluctuate with seasonal changes.