    ‘Sentence: The’ stréteh. of ‘Danube: river ‘passing  through the Batkans. drapped-so ‘Tow "that. wrecks of  World War I'boats became Visible.    Seiitence 2: Rivers were alsé.drying'up - a’ stretch of,  Danuibe passing through thie. Balkans.dropped so low  that viecks of World: War I béats-became visible .    