Who has done it
  
  The detective story is sometimes called 'whodunit' because the reader has to work __1__ who did it, who committed the crime.
  The skill of course of the writing is how many times a reader can be sent up __2__ alleys.
  Another way of putting this is how many red __3__ the author can throw in the reader's path.
  The idea is to keep the readers in a permanent state of __4__ so that they never know what's going to happen next.
  As the plot __5__, you find yourself agreeing with one character's solution and then another's.
  As a result you feel as if you are walking in a __6__ since at each turning you come to a block end.
  One of the best known detectives is Agatha Christie's Hercule Poirot who uses what he calls his little grey __7__ his brains.
  Invariably Poirots calls all the __8__ together in the last part of the story.
  One by one he __9__ the innocent until finally the murderer is unmasked.
  The thing that always surprises me is the fact that the murderer bothers to take __10__ in the final meeting.
  
  1.
   A) in
   B) out
   C) off
   D) over
  2.
   A) short
   B) twisted
   C) blind
   D) long
  3.
   A) fish
   B) sharks
   C) cod
   D) herrings
  4.
   A) suspense
   B) suspension
   C) suspending
   D) suspenders
  5.
   A) undoes
   B) unfolds
   C) unties
   D) unfurls
  6.
   A) muddle
   B) mess
   C) maze
   D) mist
  7.
   A) molecules
   B) cells
   C) particles
   D) atoms
  8.
   A) suspicions
   B) suspecting
   C) suspected
   D) suspects
  9.
   A) extinguishes
   B) excludes
   C) eliminates
   D) exerts
  10.
   A) partition
   B) part
   C) parting
   D) parted