Of the many thousands of questions they could ask you for any given office job, I'd say the most common are... tell me about yourself.. Why do you want this job? Why do you want this work in this company? What would you do if....... (2nd conditional questions related to handling difficult scenarios), what relevant experience do you have for this position/post? What are your goals for the next five years? What is your biggest strength? What is your biggest weakness?
If I were you I'd google the best way to answer these questions as there is specific information each question is looking for. I used to work in recruitment so I know these questions are very common. Book a class if you'd like to practice these questions :)