1
.
Many
wildlife
habitats
____________________
be
destroyed
if
man
keep
polluting
the
environment
.
2
.
If
the
sun
radiation
cannot
escape
into
space
,
the
Earth's
temperature
____________________
increase
steadily
.
3
.
If
he
wants
to
help
the
planet
,
then
he
____________________
have
to
change
his
habits
.
4
.
If
people
____________________
so
careless
,
the
Earth
wouldn't
be
in
danger
.
5
.
If
we
destroyed
the
ozone
layer
,
nothing
____________________
protect
us
.
6
.
If
Paul
thought
more
about
the
planet
,
he
____________________
waste
so
much
water
.
