I can't believe this thread... Either cptlaury is illiterate... or the people asking the questions were a bit OTT.. or I'm hallucinating!
However....
1. A supervisor simply cannot magic up a "plane" and demand that it be given priority. That just doesn't happen in real life (except, perhaps, if you wear a blue suit). If an aircraft is approaching which requires priority then the supervisor will liaise with the controller sensibly and work out a plan of action. (I'm seriously wondering who interviewed you - "planes" and "air strips" are not the usual terms one expects to hear in professional ATC interview boards - and if you're controlling "planes" at "airstrips" there sure won't be a supervisor!).
2. Tell your supervisor - you could save lives.
3 & 4. Agree with previous answers.
Good luck.... but you need to do a lot of work unrelated to ATC before thinking of a professional career.