The sectors of the city that were supplied by the airlift are one Soviet, one American, one British and one French. Germany was divided into zones after World War 2. Berlin was located in the Soviet zone. The city was put on a blockade to force other Western countries out.
Apartheid is specifically associated with South Africa - when there is a question mentioning this word, it's very likely that it's connected to this country. South Africa is also the correct answer here. Apartheid ended in 1994 and 1997 is the year when the new Constitution came into power.
The Great Depression was the worst economic downturn in the history of the industrialized world, lasting from 1929 to 1939. It began after the stock market crash of October 1929, which sent Wall Street into a panic and wiped out millions of investors. A third of all banks failed. 1 Unemployment rose to 25%, and homelessness increased. 2 Housing prices plummeted 67%, international trade collapsed by 65%, and deflation soared above 10%.
It is one part of linguistics, other being syntax: the study of sentence structure, phonology and phonetics: the study of sounds, morphology: the study of word structures and pragmatics: the study of actual use of language.