Раскройте скобки, употребляя Active/Passive voice (Past Simple, Present Perfect или Present Simple).
Mount Everest and K2 are believed (believe) to be the two highest mountains in the world, but they (1)________ (be) very different. Everest (2)________ (climb) for the first time in 1953, and since then thousands of people (3)________ (stand) on the summit. You (4)________ (not need) to be a professional climber – every year many people (5)________ (take) to the top by guides. But in recent years this popularity (6)__________(begin) to cause problems. Since 1953 thousands of tons of rubbish (7)__________ (left) at the foot of the mountain, and a lot of people (8)_________ (think) that the ‘Everest experience’ (9)_________ (ruin) by the number of visitors.

K2, deep in the Himalayas, (10)_________ (not measure) until 1859, seven years after Everest. It (11)__________ (say) to be the most dangerous mountain in the world, and it (12)_________ (not climb) as often as Everest has. Every year small number of mountaineers (13)_________ (try) to reach the top, but not many (14)_________ (succeed) – some of the worst Himalayan accidents in the last twenty years (15)________ (happen) on the mountain, and many lives (16)________ (lose). Tourist expeditions (17)________ (start) going to Everest in the 1980s, and the number of visitors (18)________ (rise) since then, but they (19)_________ (not go) to K2.

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