For items 1–10, read the text below and decide which answer best fits each gap. There is an example at the beginning \(0\).

Example:
0 decided
considered
referred
noticed

Machu Picchu

 The city of Machu Picchu, in Peru, South America, is \(0\) considered  to be one of the most breathtaking sights in the world\. It was built by the Incas in about 1450, when the Inca Empire was at its most powerful\. What makes this city so unusual is that it is    \(1\)  **\.\.\.**  2,430 metres above sea level , on the top of a mountain ridge in the Andes Mountains\.   
 Machu Picchu is so remote that the Incas had to take a long, treacherous path through the Andes to get to it\. To this day, historians still \(2\)  **\.\.\.**  how the Inca people were able to build this stone city so high up \(3\)  **\.\.\.**  the use of modem technology\. The Incas were expert builders, carving the rocks perfectly and \(4\)  **\.\.\.**  them together so well that you cannot slide a knife \(5\)  **\.\.\.**  the stones \.   
 Astonishingly, the \(6\)  **\.\.\.**  of the world only learned of the city's existence after an American historian, Hiram Bingham, discovered it on 24 July 1911\. Previously, only a few local people were \(7\)  **\.\.\.**  of the city\. It has now become a popular tourist \(8\)  **\.\.\.** \. People walk for up to four days on the Inca Trail through the Andes Mountains to \(9\)  **\.\.\.**  this amazing city and admire the spectacular \(10\)  **\.\.\.**  from the top\.