Mount Everest (Mt. Everest) is the highest mountain in the world. It is 8,848 metres s high. Mt. Everest was first climbed in 1953 by Edmund Hillary and Tenzing Norgay. Every year, a lot of people want to climb Mt. Everest.
It is very dangerous to climb Mt. Everest. (37) ______. Most people carry bottles of oxygen; they could die without it. When the oxygen bottles are empty, (38) ______. When strong winds rip their tents, people leave them behind. They do not have the energy i to take the rubbish away. They only have enough energy to go down the mountain safely.
(39) ______. Since people first began to climb Mt. Everest, they have left tons and tons of rubbish on the mountain. Several groups have climbed the mountain just (40) ______. When people plan to climb the mountain, they have to plan to take away their rubbish.
A. Rubbish is a terrible problem
B. to pick up the rubbish
C. people throw them on the ground
D. The air is very thin and cold
Question 37. __________