Directions: Fill in the blanks with the appropriate words. 

Tensions had been _____(1)______ throughout Europe—especially in the troubled Balkan region of southeast Europe—for years before World War I actually broke out. World War I, also known as the Great War, began in 1914 after the _____(2)_____ of Archduke Franz Ferdinand of Austria. His murder _____(3)_____ into a war across Europe that lasted until 1918. During the conflict, Germany, Austria-Hungary, Bulgaria and the Ottoman Empire (the Central Powers) fought against Great Britain, France, Russia, Italy, Romania, Japan and the United States (the Allied Powers). Thanks to new military technologies and the horrors of trench warfare, World War I saw _____(4)______ levels of carnage and destruction. By the time the war was over and the Allied Powers claimed victory, more than 16 million people—soldiers and _____(5)______ alike—were dead.