Решение: (a) run-down (b) suburbs (c) city centres Таким образом, заполненный текст будет выглядеть так:
PUTTING UK CITIES BACK ON THE MAP Twenty years ago, the centres of cities like Birmingham and Leeds, UK, were dirty, run-down areas with a reputation for crime. People moved out to the suburbs to find more space and a better quality of life. However, new generation projects are now transforming the city centres into green areas where people want to live.