1
.
Both
optimists
and
pessimists
contribute
to
society
.
The
____________________
invents
the
____________________
,
the
____________________
the
____________________
.
2
.
We
don't
stop
playing
because
we
____________________
____________________
;
we
grow
old
because
we
____________________
____________________
.
3
.
Take
care
to
____________________
what
you
____________________
or
you
will
be
forced
to
____________________
what
you
____________________
.
4
.
Now
that
we
have
learned
to
fly
the
air
like
____________________
,
swim
under
water
like
____________________
,
we
lack
one
thing
?
to
learn
to
live
on
earth
as
____________________
____________________
.
5
.
The
single
biggest
____________________
in
communication
is
the
____________________
that
it
has
taken
place
.
