他们在肥沃的河流山谷中定居。

They settled in the ___fertile river valleys.

我们有一个巨大的后院，土壤非常肥沃，我们种了各种各样的蔬菜。

We had an enormous backyard with the most ___fertile soil where we grew all sorts of vegetables.

农民们更喜欢肥沃的土地来种植庄稼。

The farmers prefer ___fertile land for growing crops.