GRE Text Completion
The Chinese, who began systematic astronomical and weather observations shortly after the ancient Egyptians, were assiduous record-keepers, and because of this, can claim humanity’s longest continuous ________ of natural events.
#1
Because many of the minerals found on the clean floor are still ________ on land, where mining is relatively inexpensive, mining the ocean floor has yet to become a ________ enterprise.
#2
The valedictory address, as it has developed in American colleges and universities over the years, has become a very strict form, a literary ________ that permits very little ________.
#3
A human being is quite ________ creature, for the gloss of rationality that covers his or her fears and ________ is thin and often easily breached.
#4
Although the passage of years has softened the initially hostile reaction to his poetry, even now only a few independent observers ________ his works.
#5
Unlike philosophers who constructed theoretically ideal states, she built a theory based on ________; thus, although her constructs may have been inelegant, they were ________ sound.
#6
Once a duckling has identified a parent, then instinctive bond becomes a powerful ________ for additional learning since, by ________ the parent, the duckling can acquire further information that is not genetically transmitted.
