pit

我不小心吞下了一颗樱桃核。

I accidentally swallowed a cherry ___pit.

他们挖了一个大坑来埋垃圾。

They dug a big ___pit to bury their garbage.

吃桃子时要小心，别咬到那个硬核。

Be careful not to bite into the hard ___pit of a peach.