在塑形饼干后，你需要用叉子把它们压平。

After shaping the cookies, you need to ___flatten them with a fork.

建筑公司计划平整土地以建造新大楼。

The construction company planned to ___flatten the land for the new building.

在陡峭的山丘后，道路变得平坦。

The road ___flattens out after the steep hill.