crusade|crusaded|crusades

他发起了一场反对种族歧视的长期运动。

He started a long-term ___crusade against racial discrimination.

她毕生致力于为环保事业奋斗。

She has ___crusaded for environmental protection all her life.

许多骑士参加了十字军东征，试图夺回圣地。

Many knights joined the ___Crusades in an attempt to reclaim the Holy Land.