Machines
get
their
power
from
different
____________________
:
?
Some
machines
work
on
____________________
power
.
?
Some
machines
run
on
____________________
.
?
Others
get
their
power
by
burning
____________________
.
A
spade
and
bicycle
work
____________________
,
powered
by
a
____________________
source
.
Cars
and
motorcycles
have
____________________
that
burn
petrol
to
create
the
energy
.
Traffic
____________________
and
mobile
____________________
are
electric
and
need
____________________
to
work
.
