我对这次考试非常有把握。

I'm ___sure I'll do well in this exam.

“当-当然，我会来参加你的生日派对！”他兴奋地说道。

"___S-sure, I'll come to your birthday party!" he said excitedly.

他肯定会赢得这场比赛。

He is ___sure to win this match.