a
)
King
Camp
Gillette
,
in
1909
,
____________________
____________________
____________________
the
invention
of
the
first
disposable
razor
blade
.
It
replaced
the
original
straight
razor
,
which
was
like
putting
a
knife
to
your
throat
.
b
)
Percy
Spencer
invented
the
microwave
oven
in
1946
.
He
____________________
____________________
the
idea
of
using
microwave
energy
to
heat
and
cook
food
while
working
at
Raytheon
.
c
)
The
vacuum
cleaner
was
invented
by
Hubert
Cecil
Booth
in
1901
.
It
was
designed
to
____________________
dust
and
dirt
____________________
by
sucking
them
into
a
cylindrical
container
.
d
)
The
invention
of
the
cell
phone
in
1977
by
Bell
Labs
____________________
____________________
previous
inventions
of
the
telephone
and
the
radio
to
work
efficiently
.
e
)
Hungarian
inventor
,
Lazlo
Biro
,
created
the
ballpoint
pen
in
1938
.
This
invention
____________________
the
old
styled
fountain
pen
____________________
,
making
it
obsolete
.
f
)
The
Wright
Brothers
invented
the
first
working
airplane
in
1903
.
They
designed
it
to
____________________
____________________
a
flying
bird
.
g
)
The
Rubik's
cube
,
invented
in1974
,
by
Erno
Rubik
,
is
a
toy
puzzle
which
is
very
difficult
to
solve
.
Many
people
spend
hours
trying
to
____________________
it
out
h
)
The
first
television
set
was
created
by
John
Logie
Baird
in
1926
.
He
designed
it
to
____________________
analog
audio
and
video
signals
____________________
.
