A.exchange C.switch B.bypass D.interact 73. A.their C.when B.that D.whose 74. A.expanded C.attracted B.contracted D.extended 75. A.what C.these B.which D.them 76. A.joined C.participated B.attached D.involved 77. A.moreover C.likewise B.however D.then 78. A.With C.In B.By D.As 79. A.contexts C.messages B.signs D.leaflets 80. A.citizen C.amateur B.civilian D.resident 81. A.into C.over B.amid D.toward