Many years ago, whites ruled South Africa. Apartheid（种族隔离制度）was the 16 （关押）for staying in this zone. 18 they saw a policeman coming towards them, and 19 . of the land. One evening, two middle-aged blacks met in a “whites only” section of Johannesburg. One of them had a permit to work in the area, the other did not, which 17 he could be put behind bars
