The
____________________
(
main
)
causes
of
____________________
(
severe
)
asthma
attacks
are
common
cold
viruses
.
Scientists
use
radiation
to
____________________
(
investigate
)
details
of
very
____________________
(
tiny
)
structures
.
A
short
ten
-
minute
walk
____________________
(
daily
)
can
be
beneficial
to
your
health
.
Unhealthy
____________________
(
habit
)
can
be
the
cause
of
many
diseases
.
The
scientists
published
their
____________________
(
findings
)
in
scientific
journals
The
body
requires
all
of
the
____________________
(
essential
)
food
groups
:
fats
,
carbohydrates
,
proteins
,
fibre
,
and
vitamins
and
minerals
.
A
new
experimental
vaccine
has
shown
____________________
(
encouraging
)
results
in
the
fight
against
lung
cancer
.
The
natural
supplements
____________________
(
activated
)
their
body's
immune
system
and
enabled
it
to
fight
against
____________________
(
sicknesses
)
