zeal

他怀着极大的热情投入到环保运动中。

He joined the environmental campaign with great ___zeal.

他的演讲充满了热情和活力，感染了在场的每一个人。

His speech was full of ___zeal, inspiring everyone in the room.

她对环保事业的热情感染了整个社区。

Her ___zeal for environmental protection inspired the whole community.