71. A) cases
B) reasons
C) factors
D) situations(C)
72. A) But
B) And
C) Besides
D) Even(A)
73. A) else
B) near
C) extra
D) similar(A)
74. A) generating
B) effective
C) motivation
D) creative(D)
75. A) origins
B) sources
C) bases
D) discoveries(B)
76. A) employed
B) created
C) operated
D) controlled(B)
77. A) came
B) arrived
C) stemmed
D) appeared(A)
78. A) less
B) better
C) more
D) worse(C)
79. A) genuine
B) practical
C) pure
D) clever(C)
80. A) happily
B) occasionally
C) reluctantly
D) accurately(D)