学生们在小组作业中非常合作，互相帮助完成任务。

The students were very ___cooperative in the group project, helping each other complete the tasks.

这家合作社帮助当地农民以更好的价格销售他们的有机蔬菜。

This ___cooperative helps local farmers sell their organic vegetables at better prices.

村民们通过合作建造了一座新桥。

The villagers built a new bridge through ___cooperative efforts.