mound|mounds

我们在那个小土丘上野餐，欣赏日落。

We had a picnic on the small ___mound and enjoyed the sunset.

孩子们在后院堆了几个小土堆玩耍。

The kids made small ___mounds of dirt to play with in the backyard.

孩子们在沙滩上堆了一个小沙堆。

The kids built a small ___mound of sand at the beach.