In the last paragraph, the author refers to a hypothesis as "a leap into the unknown" in order to show that hypotheses ______.
A. require effort to formulate
B. can lead to dangerous results
C. go beyond available facts
D. are sometimes ill-conceived
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All the staff members of the department made concerted efforts to ______ the hall for the
A. clean up
B. clear up
C. dress up
D. make up
According to the second paragraph, a useful theory is one that helps scientists to ______.
A. observe events
B. find errors in past experiments
C. make predictions
D. publicize new findings
Retail sales volume in local urban and rural areas rose 58 percent and 8 percent, ______,
A. individually
B. respectively
C. correspondingly
D. accordingly
He often quoted "reason over passion" as maxim in ______ the long-standing division among
A. adjusting
B. reconciling
C. conquering
D. consolidating