31. Airplane and television are among the ____ of science.

A. masks

B. martyrs

C. marvels

D. marrow

32. All experts agree that the most important consideration with diet drugs is carefully ____ the risks and benefits.

A. weighing

B. valuing

C. evaluating

D. distinguishing

33. Although Asian countries are generally more ____ in social customs than Western countries, there have been several notable examples of women leaders in both China and India.

A. conservative

B. confidential

C. comprehensible

D. consistent

34. Although he is very rich, his undutiful children are the ____ of his life.

A. torch

B. torment

C. topic

D. topper

35. Although he thought he was helping us to prepare the dinner, he was actually ____ the way.

A. in

B. off

C. by

D. on