1
.
With
the
____________________
(
willing
)
of
millions
to
download
these
,
their
____________________
(
popular
)
is
clear
.
What
apps
have
you
downloaded
?
How
useful
are
they
?
2
.
The
____________________
(
convenient
)
of
this
invention
is
evident
,
and
certainly
wins
a
prize
for
____________________
(
original
)
.
It
also
provides
plenty
of
____________________
(
amuse
)
.
But
would
you
really
buy
something
like
this
?
3
.
The
sheer
____________________
(
brilliant
)
of
this
invention
is
clear
,
and
the
____________________
(
simple
)
of
its
design
is
appealing
.
It
also
improves
the
____________________
(
comfortable
)
of
our
everyday
lives
.
What
other
inventions
have
made
life
better
?
4
.
This
simple
invention
certainly
improved
the
____________________
(
efficient
)
of
many
people's
working
lives
.
Its
____________________
of
use
(
easy
)
and
____________________
(
effective
)
are
part
of
its
winning
formula
.
What
other
inventions
have
contributed
to
a
better
workplace
?
