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traveled; was taking was traveling; took traveled; had taken was traveling; had taken
As long as I have traveled Traveled so much as I have As I have traveled so much Much as I have traveled
travels traveled was traveling has traveled
A Risky Trip Up Mount Everest Pollution on Mount Everest Mount Everest—Clean-up Effort Robert Hoffman and His Clean-up Team
had he been he traveled he has been he went
would change had changed was to change was changing
travels traveled will travel has traveled
How often How soon How long How many
is opposed by the local people is the largest one supported by Nepal is encouraged by the American government is the greatest one ever made on Mount Everest
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.
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.
was traveling traveled has been traveling had traveled
knows how to use a pistol must write lengthy reports on his work may travel many miles when he is on duty has a long working day
its original condition half a century ago its former state a few years ago a place without pollution at all the cleanest mountain in the world
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