电火花在空气中闪烁。

Electric ___sparks flash in the air.

铁匠打铁时，火星四溅。

The blacksmith's hammer struck the iron, sending tiny ___sparks flying.

他的演讲在我心中点燃了希望的火花。

His speech ignited ___sparks of hope in my heart.

他的演讲激发了观众的热情。

His speech ___sparked enthusiasm among the audience.