她确定明天会下雨，所以带了伞。

She is ___certain it will rain tomorrow, so she brought an umbrella.

某个学生把书包落在了教室里。

A ___certain student left their backpack in the classroom.

他对自己的答案很有把握。

He is ___certain about his answer.

随着气候变化的加剧，某些极端天气事件的发生是不可避免的。

With climate change intensifying, some extreme weather events are ___certain to occur.