For
any
airplane
to
fly
,
one
must
lift
the
____________________
of
the
airplane
itself
,
the
fuel
,
the
passengers
,
and
the
cargo
.
The
____________________
generate
most
of
the
____________________
to
hold
the
plane
in
the
air
.
To
generate
lift
,
the
airplane
must
be
pushed
through
the
air
.
The
air
resists
the
motion
in
the
form
of
aerodynamic
____________________
.
Modern
airliners
use
____________________
on
the
tips
of
the
wings
to
reduce
drag
.
The
____________________
engines
,
which
are
located
beneath
the
wings
,
provide
the
____________________
to
overcome
drag
and
push
the
airplane
forward
through
the
air
.
Smaller
,
low
-
speed
airplanes
use
____________________
for
the
propulsion
system
instead
of
turbine
engines
.
