老师向学生们简要介绍了考试规则。

The teacher ___briefed the students on the exam rules.

出发前导游简要地向我们介绍了行程安排。

The guide ___briefed us on the itinerary before we set off.

经理向我们简要介绍了新项目的进展情况。

The manager ___briefed us on the progress of the new project.