Choose the right words and expressions to complete the text. There are three ones you do not need to use.

The human body really is amazing. ... was a teenager who showed us how people with ... can ... them. He went blind at a young age after getting ... , yet he found a way to "see" his surroundings by making ... . This is a skill called ... which is also used by dolphins and bats. Doctors once believed blind people developed ... to get around, which was proven to be untrue. Now they have learned using ... that the part of the brain that controls ... is stimulated when a blind person hears echoes.
For Ben, learning to "see" took a long time, but it enabled him to cycle and ... around his neighbourhood.