collaborate|collaborated|collaborates|collaborating

你不是和他合作过你的一本书吗？

Didn't you ___collaborate with him on one of your books?

在项目期间，他们合作过的员工既友好又乐于助人。

The staff they ___collaborated with were friendly and helpful during the project.

要解决复杂的全球性问题，各国必须合作并汇集专业知识。

To solve complex global issues, nations must ___collaborate and pool their expertise.

研究人员目前正与国际合作伙伴就一项气候变化研究进行合作。

The researchers are currently ___collaborating with international partners on a climate change study.

我们的团队与国际研究人员合作开发新技术。

Our team ___collaborates with international researchers to develop new technologies.