emergence
:
the
fact
of
something
becoming
____________________
or
starting
to
____________________
proliferation
:
the
fact
of
something
____________________
a
____________________
and
____________________
in
number
or
____________________
fleet
:
a
____________________
of
____________________
,
aircraft
,
etc
.
under
the
____________________
of
one
person
or
____________________
