Read the following passage and mark the letter A. B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks.

Experts estimate that over 50% of the global population currently lives in cities, and by 2050, this percentage is expected to reach 70%. Megacities, (7)______, are becoming more common, and the concept of mega-regions, interconnected clusters of megacities, is also gaining prominence. These megacities often face challenges in accurately (8)_______. Examples of megacities include Sao Paulo, New York, and Tokyo, which is the largest megacity in the world.
China boasts the largest mega-region, consisting of megacities like Hong Kong, Shenzhen, and Guangzhou. (9)______, as seen in West Africa, where Nigeria, Benin, Togo, and Ghana form a mega-region. These mega-regions hold significant economic power, with 66% of global economic activity and 85% of new technological and scientific advancements occurring within the 40 largest mega-regions. (10)_____.
In summary, urbanization continues to rise globally, with a majority of people living in cities. Megacities and mega-regions are becoming more prevalent, (11)_____
(Adapted from Reading Advantage)