这起事故导致两辆车严重损坏。

The ___accident caused serious damage to both cars.

她在厨房里打翻了热汤，这是个意外。

She spilled hot soup in the kitchen—it was an ___accident.

在公园里遇见老同学纯属偶然。

Meeting my old classmate in the park was a complete ___accident.