With no explanation, label each line with "art-broadcastprogram", "O", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
He
became
a
senior
investigative
reporter
for
the
National
Desk
in
2010
,
where
he
wrote
a
series
in
2011
,
``
Drilling
Down
``
,
about
the
oil
and
gas
industry
and
fracking
.
He:O
became:O
a:O
senior:O
investigative:O
reporter:O
for:O
the:O
National:art-broadcastprogram
Desk:art-broadcastprogram
in:O
2010:O
,:O
where:O
he:O
wrote:O
a:O
series:O
in:O
2011:O
,:O
``:O
Drilling:art-broadcastprogram
Down:art-broadcastprogram
``:O
,:O
about:O
the:O
oil:O
and:O
gas:O
industry:O
and:O
fracking:O
.:O