语法填空（每题1分，共10分）
仔细阅读下列短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中单词的正确形式填空。
Nelson Mandela, born ________ July 18, 1918, is the first black president of South Africa. He studied law_______ he entered university. In 1944 he founded ________ ANC Youth League. Then in 1952 he set up a law office ______ ( help ) poor black people. Because of his ________( fight ) against the government and anti-black laws, he _______ ( sentence ) to five years hard labor. Fighters from ANC began to blow up buildings in 1963 ________ he was put in prison again for life imprisonment on Robben Island. Twenty-seven years later, he was freed at last by the white government. In 1993 he was made the _______ ( one ) black president of South Africa. A lot of people in the world think Nelson Mandela is _______ ( real ) a great person. _______do you think of him?