Для решения данной задачи необходимо заменить заглавные слова в конце строк с пропусками на правильные слова. Ниже приведены исправления для каждого пропущенного слова:
WAS
"But, it was until 2008 that the United Nations officially declared June 8th as World Oceans Day."JOIN
"Since 2002 a lot of nations and organisations joined this movement."IT
"In 2003, the launch of an official website was announced."BIG
"It's the second biggest ocean and covers roughly 20 % of the surface of the earth."CONTAINS
"That is one-fifth of the earth's surface. It also contains 29 % of the earth's water."MAKES
"Global communication is possible by undersea cables. The internet makes it possible by undersea cables crossing the ocean floor between continents and land masses."
После внесения этих исправлений текст будет грамматически правильным и смысловым.