我对发生的事情一无所知，我发誓。

I don't know anything about what happened, I ___swear.

她信誓旦旦地说她不知道钱怎么了。

She ___swore blind she didn't know what had happened to the money.

在一些国家，法庭上的证人必须手按圣经发誓。

In some countries, witnesses in court have to ___swear on the Bible.