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It has been one of the deadliest climbing seasons on Everest, with at least 10 deaths. And at least some seem to have been _________.

The problem hasn’t beenavalanches(雪崩）, blizzards or high winds. Experienced climbers and industry leaders _________ too many people on the mountain, in general, and too many inexperienced climbers, in particular.

Fly-by-night adventure companies are taking up untrained climbers who pose a risk to everyone on the mountain. And the Nepalese government, _________ for every climbing dollar it can get, has issued more permits than Everest can safely _________, some experienced mountaineers say.

Add to that Everest’s unmatched _________ to a growing body of thrill-seekers the world over. And the fact that Nepal, one of Asians poorest nations and the site of most Everest climbs, has a long record of bad regulations and mismanagement.

To reach the peak, climbers _________ every pound of equipment they can and take with them just enough cans of compressed oxygen to make it to the top and back down. It is hard to think straight at that altitude（海拔）.

According to the climbers, some of the deaths this year were caused by people getting held up in the long lines on the last 1,000 feet or so of the climb, unable to get up and down fast enough to _________ their oxygen supply. Others were simply not fit enough to be on the mountain _________.

Nepal has no _________ rules about who can climb Everest, and experienced climbers say that is a direct reason for _________. “You have to reach certain standards to do the Ironman,” said Alan Arnett, a remarkable Everest climber. “But you don’t have to _________ to climb the highest mountain in the world? What’s wrong with this picture?”

The last time 10 or more people died on Everest was in 2015, during an avalanche. By some measures, the Everest machine has only gotten more out of _________. Last year, experienced climbers, insurance companies and news organizations _________ a far-reaching scheme by guides, helicopter companies and hospitals to trick millions of dollars from insurance companies byevacuating(疏散) climbers with _________ signs of altitude sickness.

Despite all the problems, this year the Nepali government issued a record number of permits, 381, as part of a bigger _________ to commercialize the mountain. Climbers say the permit numbers have been going up steadily each year and that this year the traffic jams were heavier than ever.