30. The farmers were more anxious for rain than the people in the city because they had more ______.

A. at length　 　　　　　　　 B. at last　　 　　　　　　 C. at stake　 　　　　　　　 D. at most

29. As is often pointed out, knowledge is a two-edged weapon which can be used ______ for good or evil.

A. similarly　 　　　　　　　　 B. widely　　 　　　　　　　 C. equally　 　　　　　　　　 D. properly

28. Heavy drinking used to be acceptable, but as drunken driving has caused so many tragedies public opinion is no longer ______.

A. accurate　 　　　　　　　 B. tolerant　　 　　　　　　　 C. appropriate　 　　　　　 D. reliable