Complete blanks with ''the'' or ''-''. ( -, means blank)

Lions are 1)………………..……… second largest big cat species in the world. Unlike languages, 2)………………..……… mathematics is the same in every country. 3)………………..……… Mount Everest is the tallest mountain on the planet. Hundreds of years ago, people actually believed 4)………………..……… Earth was flat! Crows remember 5)………………..……… faces of humans who threaten their habitat. 6)………………..……… Russia is the largest country in the world. 7)………………..……… nose of each cat is unique, just like a human finger-print.