Today the police are able to make use of all kinds of scientific and technological achievements in their fight against crime. This was not always the (i) _______ , however. In the early days of the British police force, during the nineteenth century, the police office’s whistle was his main way of calling for help if he got into (ii) _______ . Gradually, in the twentieth century, things (iii) _______ _ to improve.
Those police officers who were lucky enough to be given a patrol car rather than a bicycle could also took (iv) _______ of radio communications. In 1903, a new system for identifying people by their fingerprints was discovered. (v) _______ it soon proved to be one of the most significant developments in crime investigation, a seareh of the national fingerprint collection could take days, if not weeks, until computers were introduced in the 1970s.
(iv)_________