我确信我做出了正确的决定。

I ___have ___no ___doubt I made the right decision.

我确信你会成功。

I ___have ___no ___doubt that you will succeed.

玛丽亚和我一起去的，我确信她和我一样喜欢那个湖。

Maria went with me, and I ___have ___no ___doubt she loved the lake like I did.