One Word Substitution

DIRECTIONS : In each of the following questions, out of the four alternatives, choose the one which can be substituted for the given words/sentence.
76. One filled with excessive and mistaken enthusiasm in cause
  A.  Pedant
  B.  Patriot
  C.  Fanatic
  D.  Martyr
77. Government by the representatives of the people
  A.  Autocracy
  B.  Socialism
  C.  Diplomacy
  D.  Democracy

78. A person working in the same place with another
  A.  Assistant
  B.  Comrade
  C.  Contemporary
  D.  Colleague
79. An old unmarried woman
  A.  Virgin
  B.  Bachelor
  C.  Matron
  D.  Spinster
80. A person who enters without any invitation
  A.  Vandal
  B.  Thief
  C.  Burglar
  D.  Intruder