16:55 Articles 18 Fill in the where necessary. Did you know? 1 Rafflesia arnoldi is the largest flower in ... world. It weighs 7kg and grows only in ... Sumatra, Indonesia 2 ... Johann Vaaler invented ... paperclip in 1899 3... Badminton became an Olympic sport in 1992 4 It took ... Egyptians 20 years to build ... Great Pyramids. 5 ... most important river entering ... Black Sea is... 6 ... bass is ... largest of ... string instruments ​