People
have
been
on
____________________
for
hundreds
of
thousands
of
years
.
Early
people
learned
to
control
and
use
____________________
.
Because
of
their
____________________
tools
,
they
are
called
____________________
____________________
people
.
They
____________________
form
____________________
to
place
and
killed
____________________
for
____________________
and
made
____________________
from
their
____________________
.
