Not all towns and cities _____________ beautiful buildings or historic monuments., have, are having, However, in recent years, interest _____________ in branding cities as sustainable or green., has grown, has been growing, both, Nowadays, people _____________ more and more committed to the idea of fighting climate change., become, are becoming, An increasing number of cities _____________ to sell themselves as environmentally friendly., begin, are beginning, Twenty years ago, Hamburg, in northern Germany, _____________ a reputation as an industrial centre., had, was having, The pollution in the city _____________ at that time., was increasing, increased, The local authorities realised that they ____________ too much on jobs and industry and not enough on the environment., had been focusing, had focused, both, The local government ________________ a series of green initiatives to focus on making the city greener., introduced, was introducing, Their initiatives _____________ the city into one of the greenest cities in Germany., have transformed, have been transforming, A green roofs policy was introduced in 2015, which means that soon some of the early roofs ________________ for ten years, will have been growing, will have grown

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