Some research tells us that between ages two and five, children become aware of _____ .
A. gender
B. tender
C. gentle
D. slender
With so many _____ , the exact cost of this experiment is difficult to estimate.
A. vary
B. various
C. variables
D. varieties
It is a _____ to say you support him but would not vote for him in the election.
A. contradict
B. contradictory
C. contrary
D. contradiction
Her own experiences had made her _____ to other people's troubles.
A. sense
B. sensitive
C. sensory
D. sensational