This is probably not efficient, but it gets the results you want.

select work_id, work_level from work
where work_level = 1
UNION
select work_id, work_level from work
where work_level = 0
UNION
select work_id, work_level from work
where work_level = 2
UNION
select work_id, work_level from work
where work_level = 5
UNION
select work_id, work_level from work
where work_level = 7
UNION
select work_id, work_level from work
where work_level = 9;

- Magnus