21. Friends might not be always trust-worthy, but dogs are; they have long been regarded as the most _______ company of human beings.
A. reliable
B. regular
C. reluctant
D. religious
22. All employment _____ must include the names and telephone numbers of at least two personal references.
A. applicants
B. applying
C. applied
D. applications
23. Even when he is short of money he keeps $20 in the bottom of his shoe _____ there is an emergency.
A. although
B. in spite of
C. since
D. in case
24. _____ in the company for three years, Mark has become experienced in business negotiations.
A. Having worked
B. Have been working
C. Have worked
D. Worked
25. If you had told us that your guest was interested in Native American Art, we certainly _____ for a trip to the museum.
A. had arranged
B. would have arranged
C. will arrange
D. arranged
26. Most doctors of the Colonial period believed _______ was caused by an imbalance of humors in the body.
A. in disease
B. that disease
C. of disease
D. about disease
27. In 1976 Sarah Caldwell became _________ at the Metropolitan Opera House in New York City.
A. she was the first woman to conduct
B. the first woman conductor
C. the woman was first conducting
D. the woman conducts first
28. On January 7, 1955, Marian Anderson became _________ to sing a major role at New York City's Metropolitan Opera House.
A. the first African American
B. the first African American was
C. she was the first African American
D. when the first African American
29. Perhaps the most significant postwar trend was the decentralization of cities throughout the United States, _________ when massive highway-building programs permitted greater suburban growth.
A. and accelerated a phenomenon
B. a phenomenon that accelerated
C. accelerating a phenomenon which,
D. the acceleration of which phenomenon
30. We are interested in the weather because it _____ us so directly——what we wear, what we do, and even how we feel.