Active Passive

Change the following from active to passive: The architect is designing a cantilevered pedestrian bridge.

Change the following from active to passive: The agency had been monitoring dissent groups covertly for months.

Convert the sentence provided below from its passive voice structure to an active voice structure: The matter is being investigated by the internal committee.

Convert the sentence provided below from its passive voice structure to an active voice structure: The law is supposed to be enforced strictly in sensitive areas.