野餐后，我们三明治的残渣散落在毯子上。

After the picnic, the ___remains of our sandwiches were scattered on the blanket.

我们探索了河边一处罗马人定居点的古老遗迹。

We explored the ancient ___remains of a Roman settlement near the river.

那座老工厂的砖石废墟现在是受保护的历史遗址。

The old factory's brick ___remains are now a protected historical site.