1.'At' (nie wiem co chcesz tutaj powiedziec - ale chyba nie tak) work in the cafe FOR almost A year, in the club 'of' FOR about 6 months. It
is 'a' (niepotr) regular work.
2.I'm renting a flat and I must somehow pay THE rent (reental to cos innego) for my apartment.
3.I'm sorry about THE 'slow' (zle uzycie slowa tutaj, napewno masz na mysli 'delay in answring') 'answers' (niepotr), but I was at work and there was a big 'stir' (nie, nie tak, ale nie wiem co chcesz powiedziec- zamieszanie?).