那群青少年经常在公园里聚集，引起了居民的担忧。

The ___gang of teenagers often gathers in the park, causing concern among residents.

一群工人被派去清理街道。

A ___gang of workers was sent to clean the streets.

孩子们聚在一起准备去公园玩。

The kids decided to ___team together for a trip to the park.