It is very difficult, for the time being, to ________ how much money is needed.
A. account
B. sign
C. range
D. estimate
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The teacher praised and rewarded the good ________ of his students in class.
A. status
B. behavior
C. function
D. sign
We must ________ our attention on the question of reducing our cost.
A. pay
B. focus
C. absorb
D. promote
She has been known to become upset at the ________ of blood.
A. sight
B. view
C. show
D. range
The age ________ of the study population will greatly influence the final result.
A. barrier
B. position
C. distance
D. range