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

Pada soal ini kita membutuhkan subjek dan main verb sesudah conjunction (where).
Ambil opsi C. subjek (the Revolutionary War) main verb (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

Pada soal ini kita membutuhkan conjunction dan main verb yang tepat.
Secara konteks makna, yang tepat adalah B. conjunction (which) main verb (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

Pada soal ini kita membutuhkan conjunction dan subjek.
Ambil opsi C. conjunction (that) subjek (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

Pada soal ini setelah conjunction (how), kita butuh subjek dan main verb.
Ambil opsi B. subjek (green plants) main verb (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

Pada soal ini kita butuh main verb tunggal untuk subjek uncountable (Air).
Ambil opsi C. main verb tunggal (has).

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

Pada soal ini kita butuh subjek dan modals + be.
Ambil opsi A. subjek (metals) modals + be (could be).

47. ________ quickly after an animal dies.
A. In the degradation of DNA
B. Degrading DNA
C. DNA degrades
D. For DNA to degrade

Pada soal ini kita butuh subjek dan main verb untuk klausa kiri.
Ambil opsi C. subjek (DNA) main verb (degrades).

48. ________ aerodynamic design has contributed a major part in reducing resistance to motion.
A. Improved
B. It improves
C. Improvement
D. They improve

Pada soal ini kita butuh adjective untuk noun (aerodynamic design).
Adjective bisa dimainkan oleh past participle.
Ambil opsi A. past participle (Improved).

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

Pada soal ini kita butuh subjek dan main verb setelah conjunction so.
Ambil opsi D. subjek (tourists) main verb (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

Pada soal ini kita butuh main verb setelah conjunction what.
Ambil opsi B. main verb (causes).