People are often puzzled with how to say posao and zanimanje in English. The easiest way is to refer to everything as ‘job’. But English has much more to offer…
A job (countable noun) is the regular paid work that you do for an 1. _, especially when you work for a company or public organization. A friend of mine told me his last job was with a computer firm and his 2. _ job is in advertising. But, he would like a job in TV. Are there any jobs (not work or works) in TV? He might 3. _ for a job there. It might be hard to get a job (or 4. _ a job) there or 5. __ down a job (keep a job when this is difficult).
Work (uncountable noun) is used in a more general way to talk about activities you do to earn money, either working for a company or for yourself (like employment). This friend of mine started work when he was eighteen. People who are employed are 6. _ work (have a job). However, there are people 7. _ of work (without a job). They are 8. _ for work, but they have difficulties 9. _ work. Another friend of mine is 10. __ to work (start a job again after a while) after being on a maternity leave. You should try to avoid questions such as What is your job? or What is your work?, but say What do you do (for a living)? Be also aware that you usually have a lot of work to do when you are busy, and not a lot of job.