33. The citizens worry about____ is doing.
A. what the government
B. the government
C. it
D. is what the government
34. The company was prepared for____ happened with the economy.
A. it
B. the problem
C. what
D. when
35. Today the true story of ____ at Little Bighorn remains a mystery.
A. happened
B. it happened
C. what happened
D. what happening
36. For more than a decade, ____ that certain species are becoming scarce.
A. the warnings of bird-watchers
B. warn the bird-watchers
C. bird-watchers have warned
D. a warning for bird-watchers
37. Early in the eighteenth century, Halley accurately predicted when ________of 1682 would return.
A. the comet
B. was the comet
C. the comet was
D. had the comet
38. No single factor explains why ________ vary so greatly among individuals.
A. aging affects
B. the effects of aging
C. aging has an effect
D. the aging effect
39. Lack of clarity about________ the party in the coming year will be removed at the party’s convention.
A. will lead
B. lead
C. they will lead
D. who will lead
40. We do not________ the bow drill was first developed for woodworking or fire making.
A. whether it
B. know whether it
C. know whether
D. sure whether
41. Minute Man National Historical Park is a monument to where________
A. the beginning of the Revolutionary War
B. in the beginning of the Revolutionary War
C. the Revolutionary War to begin
D. the Revolutionary War began
42. Tests on the colors of cars were conducted at the University of California to determine ________the safest colors for cars.
A. which
B. which were
C. if
D. how were
43. The National Institute of Dental Research estimates ________ in fluoridated areas have about 25 percent less tooth decay than children elsewhere.
A. for school children
B. school children’s
C. that school children
D. that for school children
44. The process of photosynthesis explains how________ able to use the energy in sunlight to manufacture foods from the simple chemicals in air and water.
A. green plants
B. green plants are
C. planting greens
D. with green plants are
45. Air near the equator________ a faster west-to-east motion than air farther from the equator.
A. to have
B. it has
C. has
D. having
46. About 4000 B.C., humans discovered that________ obtained from special rocks called ores.
A. metals could be
B. the ability of metallic
C. possibly metallic
D. could metals be
47. ________ quickly after an animal dies.
A. In the degradation of DNA
B. Degrading DNA
C. DNA degrades
D. For DNA to degrade
48. ________ aerodynamic design has contributed a major part in reducing resistance to motion.
A. Improved
B. It improves
C. Improvement
D. They improve
49. The southern part of Florida is much warmer in the winter than the northern part, so more________ to the south.
A. flocking tourists
B. touring flocks
C. flocks of tourists
D. tourists flock
50. The Moon’s gravity pulls water on the near side of the Earth toward the Moon, and this is what ________ tides to occur.
A. the cause
B. causes
C. causing
D. the cause of
51. ________, they pick up fragments of rock which become frozen into the base of the ice.
A. Glaciers move
B. Glaciers moving
C. They were glaciers
D. As glaciers move
52. The tape measure first evolved from ________ used by the Egyptians.
A. the chains measure
B. the chains are measured
C. the chains are measuring
D. the measuring chains
53. A typical Atlantic hurricane starts as a low pressure system near ________.
A. Africa coasts
B. coast to Africa
C. the African coast
D. Africa has a coast
54. It is not clear whether the subdivisions of the neocortex ________ units.
A. individual
B. are individual
C. they are individual
D. individually
55. The job________ started yesterday was rather difficult.
A. when
B. was
C. after
D. that he
56. ________ just dropped off a package for you is my sister.
A. The woman
B. The woman who
C. Because the woman
D. With the woman
57. Modern humans, who first appeared about 600,000 years ago, ________ Homo sapiens.
A. calling
B. were called
C. they called
D. they were called
58. The first writing ________ evidence of is on Mesopotamian clay tablets.
A. we
B. that we
C. has
D. that we have
59. ________ drought-resistant plants which store water in fleshy tissue.
A. Succulents are
B. Succulents
C. They are succulents
D. Succulents which are
60. Benjamin Kabelsky, whom________ as Jack Benny, was a famous comedian in vaudeville and on radio and television.
A. most people’s knowledge
B. most people know
C. knowing most people
D. the knowledge of most people
61. ________ that hunted other animals tended to have very narrow, sharp, curved claws.
A. For dinosaurs
B. Dinosaurs are known
C. Dinosaurs
D. Like dinosaurs
62. The first eyeglasses had convex lenses for the aged who________ far-sighted.
A. had become
B. they had become
C. becoming
D. it became
63. Chimney Rock________ 500 feet above the North Platte River, has eroded considerably in the last two centuries.
A. stands
B. in standing
C. it stands
D. which stands
64. ________ that accompany recurring bouts of severe depression reduce bone density.
A. It changes hormones
B. Hormonal changes
C. The hormones change
D. The change in hormones is
65. Willa Cather is an author________ for her evocative and memorable vision of frontier prairie life.
A. whom readers
B. the praise of readers
C. whom praisings
D. whom readers praise
