填空题 Read the following text and fill each of the numbered spaces with one suitable word. Write your answers on ANSWER SHEET 1.
Between 1852, when {{U}} {{U}} 1 {{/U}} {{/U}}was first established that Mount Everest was the highest mountain on earth, and 1953, when Edmund Hillary, and Tenzing Norgay finally reached the peak's summit, it was every mountaineer's dream to become the first person standing on the world's {{U}} {{U}} 2 {{/U}} {{/U}}point. And George Mallory was one of the most tenacious early contenders.
Mallory was introduced {{U}} {{U}} 3 {{/U}} {{/U}}rock climbing while studying at Winchester College. {{U}} {{U}} 4 {{/U}} {{/U}}completed his studies, he settled into a career {{U}} {{U}} 5 {{/U}} {{/U}}a teacher at Charterhouse School, and continued to pursue his passion {{U}} {{U}} 6 {{/U}} {{/U}}climbing in his spare time.
Mallory's {{U}} {{U}} 7 {{/U}} {{/U}}trip to Everest was a reconnaissance mission in 1921 {{U}} {{U}} 8 {{/U}} {{/U}}aimed to produce the first accurate maps of the region. Two {{U}} {{U}} 9 {{/U}} {{/U}}visits to the mountain followed. Then, on 8 June 1924, {{U}} {{U}} 10 {{/U}} {{/U}}his third attempt to reach the summit, Mallory and his partner, Andrew Irvine, disappeared.
Several expeditions subsequently attempted to find the pair, and Mallory's {{U}} {{U}} 11 {{/U}} {{/U}}was finally discovered in May, 1999, at 8,169 metres, 600 metres {{U}} {{U}} 12 {{/U}} {{/U}}the summit, {{U}} {{U}} 13 {{/U}} {{/U}}with various items of equipment, including handwritten letters to his wife, a pocket knife, an oxygen bottle and his goggles, {{U}} {{U}} 14 {{/U}} {{/U}}were later donated to the Royal Geographical Society {{U}} {{U}} 15 {{/U}} {{/U}}Mallory's family.
There is still considerable debate as to {{U}} {{U}} 16 {{/U}} {{/U}}Mallory reached Everest's summit. The {{U}} {{U}} 17 {{/U}} {{/U}}that his goggles were found in his pocket has led some to suggest that he was on his way down the mountain {{U}} {{U}} 18 {{/U}} {{/U}}he fell. Had he been ascending in daylight, he would have been wearing the goggles to {{U}} {{U}} 19 {{/U}} {{/U}}snow-blindness, and given what is known of the pair's climbing schedule, if it were {{U}} {{U}} 20 {{/U}} {{/U}}when they fell, they must have been on their way back down.