koreanhistory1-1, Exercise 3: Korea, Goryeo and Goguryeo

Model answer (a sample; yours will differ):

1. [Source] Goryeo was a shortened form of Goguryeo, first used in the fifth century, and the Goryeo dynasty regarded itself as Goguryeo's successor (Names of Korea).
2. [Source] The English "Korea" is an exonym derived from Goryeo; Marco Polo's "Cauli" came from Chinese Gaoli, and the spelling "Korea" first appears in late seventeenth-century writing by Hendrick Hamel (Names of Korea).
3. [Source] Names are spelled several ways because of mismatches between spelling and pronunciation, the shortage of Latin vowels, older conventions and personal choice; the surname Yi is "variously romanized as Lee, Yi, I, or Rhee" (Romanization of Korean).
[My own reading, if added: the three names are one thread of continuity claimed by later states; the sources show the claim, not that it was accurate.]