At
the
end
of
the
____________________
Age
,
people
in
the
____________________
East
started
to
use
____________________
and
so
____________________
was
discovered
.
The
Metal
____________________
is
divided
into
____________________
Age
,
____________________
Age
and
____________________
Age
.
The
____________________
from
one
age
to
____________________
varied
from
____________________
to
place
.
