The history of life on earth has been a history of ____ between living things and their surroundings.
A. introduction
B. interview
C. interference
D. interaction
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I've seen Donna in lots of movies, but I've never seen her ____.
A. in person
B. in reality
C. in practice
D. in theory
The Democratic and Republican parties hold ____ every four years to choose candidates for President.
A. concessions
B. conservations
C. conversations
D. conventions
The annual income of one school teacher in this place was ____ at $900 on average.
A. budgeted
B. predicted
C. assessed
D. accounted
Reading is a pleasant way to spend one's ____.
A. leisure
B. relaxation
C. relief
D. recreation