Your math instructor would have been happy to give you a makeup examination had you gone and explained that your parents had been ill at the time.
A. would have been
B. had you gone
C. explained
D. had been

A．may not be as profitable as they are expected
B．can be measured in dollars and cents
C．rely on conformity to a standard pattern
D．are mostly underestimated by management

A．have a keen interest in prediction
B．often speculate on the future
C．think highly of creative thinking
D．stick to "scientific method"