Rewrite the sentences using passive structures. 1 Candido Rondon extended telegraph lines into the Amazonian jungles. 2 The job required a skilled engineer. 3 People are using Candido Rondon's maps to this day. 4 They discovered many rivers along the way.
1. Telegraph lines were extended into the Amazonian jungles by Candido Rondon.
2. A skilled engineer was required for the job.
3. Candido Rondon's maps are being used to this day.
4. Many rivers were discovered by them along the way.