Machines
help
us
to
make
work
____________________
and
save
____________________
and
____________________
There
are
two
types
of
machines
:
____________________
machines
and
____________________
machines
.
Simple
machines
have
____________________
parts
,
for
example
,
the
wheel
.
Complex
machines
have
____________________
parts
,
for
example
,
a
bicycle
.
