Lesson 24, Exercise 12: An Example of an Injustice

Watch the video. Answer the question.
On the left we see Nelson Mandela in prison, but he's smiling, showing his courage. On the right, we see Elton from the video, who writes about the injustice done to 
  Nelson Mandela.
Injustice (countable noun): an unfair action.
Plural: Injustices
For example, Nelson Mandela was innocent, but he spent 6 and a half years in prison.
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