STages
of
a
river
are
____________________
,
____________________
____________________
,
middle
course
,
____________________
____________________
,
and
the
mouth
.
The
first
is
the
____________________
because
its
when
the
river
____________________
,
the
____________________
is
the
latest
,
because
it
____________________
it
stage
.
The
____________________
is
the
____________________
____________________
,
because
the
river
____________________
in
____________________
____________________
of
its
____________________
.
