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A. As the difficulty was great Great as the difficulty was A.great difficulty as it was The difficulty was great
obtained sustained maintained realized
To be trapped Having trapped Trapping Trapped
Having been told Having told Tell Telling
As the difficulty was great Great as the difficulty was Great difficulty as it was The difficulty was great
ruined transported trapped sheltered
obtained sustained maintained realized
The success in climbing up the mountain. The environmental pollution of the mountain. The equipment for their trip to the mountain. The risks facing the climbers of the mountain.
isn’t it is it isn’t there is there
Having been told Having told Tell Telling
destroyed transported trapped sheltered
To make Everest even cleaner than it was. To tell climbers not to leave waste materials. To take away all the trash they could find there. To collect and treat human waste before the ice melted.
to stop stop stopping stopped