(I) One of the most widespread devices ever invented,
the bicycle is everywhere. (II) Far cleaner than a car and
quicker than walking, bicycles have become popular.
(III) Bicycles in various forms were built by a host of
inventors during the 19th century. (IV) They were
uncomfortable and difficult to ride, but a quick
succession of innovations towards the end of the
century delivered bicycles that more closely resemble
the machines we know and love today. (V) Bicycles are
made of light material to enable the owner to carry
easily in case they are broken down.