葡萄园里有一簇簇成熟的葡萄挂在藤上。

There are ___clusters of ripe grapes hanging on the vines in the vineyard.

葡萄藤上结了好几串葡萄。

There are several ___clusters of grapes growing on the vine.

学生们在操场上三三两两地聚在一起。

The students ___clustered in small groups on the playground.