上周，罗布主动提出组织团建活动。

Last week, Rob ___volunteered to organize the team-building event.

她主动提出带我们参观新图书馆。

She ___volunteered to give us a tour of the new library.

尽管日程繁忙，他仍主动提出指导新员工。

Despite his busy schedule, he ___volunteered to mentor new employees.