我无法以任何确定性回答那个问题。

I'm unable to answer that question with any ___certainty.

我可以肯定地说，这个小镇就是波兰文化的瑰宝。

I can say with ___certainty that this town is just a treasure of Polish culture.

无法确定这个项目会成功。

There is no ___certainty that the project will succeed.