Answer:
A road was built by the government right outside her front door.
Step-by-step explanation:
In a sentence with passive voice, the subject does not do the verb. Rather, the verb is done to the subject.
In the original sentence, the subject is the government, and they built a road. They did the act of building the road.
In the sentence with passive voice, the subject is the road, and it was built by the government. The act of building was done onto the road.