1. How long have you worked here?
2. Why is the position vacant and how long have you been sourcing candidates?
3. What do you like most about working here?
4. What do you like least about working here?
5. What are the next steps in this process (meaning the interview)?
6. What is your timeframe to fill the position?
Remember, if the interviewer has already answered any question above, don't ask it just to hear them repeat themselves.