In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.
The world is becoming increasingly (1)_______. Since 2007, more than half of the world’s population has been living in cities, and that share is (2)_______ to rise to 60 percent by 2030. Cities and metropolitan areas are powerhouses of economic growth—(3)_______ about 60 percent of global GDP. However, they also account for about 70 percent of global carbon emissions and over 60 percent of (4)________ use. Rapid urbanization is resulting in a growing number of slum dwellers, inadequate and (5)________ infrastructure and services, worsening air pollution, and unplanned urban sprawl.
Select the most appropriate option to fill in blank number 3.