[на 100% верно] Объедините два предложения в одно с завершенной формой причастия I согласно модели. ... the participant of the conference asked if he could leave.

Объедините два предложения в одно с завершенной формой причастия I согласно модели.

Model:

The English teacher gave the students a brief test. She had explained a new rule.

Having explained a new rule the English teacher gave the students a brief test.

The participant of the conference asked if he could leave. He had given his report.

... the participant of the conference asked if he could leave.