由于严格控制开支，学校本学年预算资金只使用了80%。

The school ___underspent its budget by 20% this academic year due to strict cost control.

由于部门今年的预算结余，我们有机会将更多资源投入到新项目中。

The department's ___underspend this year gave us the chance to invest more resources in new projects.