他说话时带着冷静的自信。

He spoke with calm ___assurance.

"我敦促你们保持冷静，等待救援队，" 马克自信地说。

"I urge you to stay calm and wait for the rescue team," said Mark with ___assurance.

尽管面临挑战，她以坚定不移的自信面对它们。

Despite the challenges, she faced them with unwavering ___assurance.