; B) these C) who D) they
72. A) on B) with C) under D) for
73. A) formed B) altered C) believed D) thought
74. A) operation B) position C) motion D) location
75. A) how B) which C) that D) what
76. A) around B) across C) on D) above
77. A) since B) so C) while D) for
78. A) to B) by
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