Then just don't accept them and wait for one to come along that you want your sim to finish. There is not too many choices, accept or don't accept. Alot of opportunities help them in advancing in their job quicker, more money. Yes, some of the opportunities take time, but those are usually the ones that help in the job performance the most. If you want to just not choose opportunities, then in the long run, they won't make as much money and that is the whole point of working.