1. They had cooperated closely in the planning of the project. 他们曾密切合作，共同规划这一项目。
2. Their captors told them they would be killed unless they cooperated. 抓住他们的人说如果他们不配合就杀掉他们。
3. City officials cooperated with the 4-H members in planting trees, building cooking facilities, pick-me tables, swings and public rest rooms. 市政府官员与四健会成员合作种树、建造烹饪设施、自选桌子、秋千和公共卫生间。
4. The three clubs cooperated in planning a party. 这三个俱乐部合作准备举办一个晚会。
5. The two countries cooperated to design the satellite. 这两个国家合作设计人造卫星。
