Read the passage and mark the letter A, B, C or D to indicate the correct answers from 18 to 22

Nelson Mandela was a very important leader in South Africa. He fought against apartheid, which was a system ___(1)___ Under apartheid, Black people did not have the same rights as white people and were treated unfairly. Mandela wanted to change this and believed ___(2)___.
Mandela joined a group called the African National Congress (ANC) to help end apartheid. He spoke out against the unfair laws and organized protests for equal rights. In 1962, he was arrested for his work and sent to prison for 27 years. ___(3)___ Mandela never gave up on his dream for a free South Africa. Many people around the world supported him and wanted him to be free.
In 1990, ___(4)___ He continued to work for equality and helped end apartheid. In 1994, South Africa had its first election where everyone could vote, no matter their skin color. Mandela was elected President and worked hard to bring people together and improve the country. ___(5)___ His work changed South Africa and inspired many people around the world, showing that one person can make a big difference in the fight for justice.