confound|confounded|confounding

我经常把这两个相似的调味料搞混。

I often ___confound these two similar spices.

他的奇怪行为让所有人都感到困惑不解。

His strange behavior ___confounded everyone.

她突然改变主意，这令人非常困惑。

Her sudden change of mind was ___confounding to everyone.