山坡上有一大群羊在吃草。

There is a large ___flock of sheep grazing on the hillside.

牧师关心他的信众，经常为他们祈祷。

The minister cares deeply for his ___flocks and often prays for them.

每到春天，鸟儿们成群结队地飞回北方。

Birds ___flock back to the north every spring.