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The word “overarching” (l.5) means all-encompassing.

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Climate change is an important issue of our time which has increasingly caused population growth.

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Scientists have worked on integrating Earth- and satellite-based observing networks for decades.

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Scientists are once again exploring waters which have not yet been explored.

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The present public sector infrastructure needs to be replaced by other models.

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The government primary concerns have also to do with improving its organization by making it more modern.

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Electronic voting began to be used in the late 1990’s.

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The number of people casting their votes in 2008 election added up to less than twice over 50 millions.

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The Brazilian tax return system is entirely Internet-based.

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In the text, “over the years” (l.7) is synonymous with “through decades” (l.8).