Here is the completed text with the correct forms of the words:
Death Valley 1 is known as the 3 hottest one of the most spectacular places in the USA. It 2 is located in the USA and 4 offers beautiful landscapes. In 1913, a temperature of 57 C 5 was recorded. The valley 6 is surrounded by high mountains. It 7 has been called Death Valley since 1850 because a group of pioneers 8 died there, and others were afraid of 9 dying there too. Ten years earlier the pioneers 10 left their homes to go to California because gold 11 was found there. In 1933, Death Valley 12 was made a national monument by President Herbert Hoover. Today the mines 13 are closed and in most places it is too 14 dangerous to enter them. But some of the mines 15 have been repaired and now tourists 16 are able to visit them.