6. Read the text and fill in the gaps with the proper grammatical form of the capitalized words.

History of Skyscrapers (Continued)

During the early 20th century the construction of tall buildings (1) became very popular in big cities. Cities grew (2) bigger as (3) big people could live and work there. Tall buildings (4) were also seen as a symbol of power and greatness. Major cities, especially in America, (5) fight for the (6) tallest buildings in the world. For four decades the Empire State Building in New York was the world's (7) highest structure. The 381-metre high landmark has 102 stories and (8) was completed in 1932. The World Trade Centre, (9) finished in 1973, became a symbol of the city's economic strength. The destruction of CITY the World Trade Centre in the terrorist attacks of 2001 (11) hit the heart of the city. Today the HIT