Scientists have worked ______ some promising solutions to water pollution in big cities. 

Use the words and phrases, and add some words where necessary to make meaningful sentences. Change the verb forms if necessary.

More / more / people moving / urban areas / seek employment.

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There has been a rapid increase in the urbanisation rate. (increase)

The urbanisation ________________________.

Housing / getting / more more expensive / big cities.

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It / first time / I / visit / such / modern building.

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