他们挖了一个大坑来埋垃圾。

They dug a big ___pit to bury their garbage.

创建一个堆肥坑是回收厨房废物的有效方法。

Creating a compost ___pit is an effective way to recycle kitchen waste.

建筑工地上有一个用于地基的深坑。

The construction site had a deep ___pit for the foundation.