The _________ region of the Mariana Trench is nearly 11,000 meters below sea level.
A. deep
B. deeper
C. deepest
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Some places are named after the person who _________ them, such as the Cook Islands, which were named in honor of Captain James Cook.
A. discover
B. discovery
C. discovered
McMurdo Station, a research center in Antarctica, is located in one of the most remote _________ of the world.
A. region
B. regions
C. regional
Calakmul is one of the largest Mayan cities ever found, but because it is _________ in the jungles of southern Mexico, this ancient settlement is hard to visit.
A. hide
B. hiding
C. hidden
During his many trips to remote regions, British explorer Ranulph Fiennes has _________ frostbite -- an injury caused by extreme cold -- several times.
A. experienced
B. experiences
C. experiencing