题目内容

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

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