他花了很多精力来完成这个项目。

He put a lot of ___effort into completing this project.

志愿者们在野生动物保护方面的努力产生了重大影响。

The volunteers' ___efforts in wildlife conservation have made a big difference.

她的努力最终带来了项目的成功。

Her ___efforts finally led to the success of the project.