做面包时，你需要加入酵母才能让面团发酵。

When making bread, you need to add ___yeast to make the dough rise.

这种啤酒的特殊风味来自其中添加的酵母。

The unique flavor of this beer comes from the ___yeast added to it.

他的演讲如同燃料般激发了团队的创造力。

His speech served as ___fuel to inspire the team's creativity.