Ответ:

  1. Sam went to Brazil.
  2. The Nile is in Egypt.
  3. Lake Naroch is the biggest lake in Belarus.
  4. My dream is to travel across South America.
  5. They had a map with them when they climbed Everest.
  6. I would like to see the Indian Ocean.
  7. There are no high mountains in the United Kingdom.

Названия большинства стран, городов, озёр и отдельных гор употребляются без артикля; названия океанов и государств с нарицательным компонентом — с определённым артиклем the.