How would you approach your supervisor if you are in need of sick/leave time?

Remaining positive and letting the interviewer know that you would try your best to give advance notice. That is not always possible, but you want to convey that you would let them know as soon as you do if you need sick or leave time.

Seeming indifferent to others' time. If you will need to be out of the office, someone else would need to cover your duties, so you want to be sure you are clear you understand that.

"If I am sick, I would try my best to give as much advance notice as I could. If appropriate, I would call or text you the night before my shift to let you know. There are obviously occasions where one wakes up ill. If that were the case, I would let you know immediately. I understand that emergencies happen, and I am more than willing to cover for a sick co-worker if they had an emergency."

"Before I plan a vacation/leave time, I would speak with you to determine the most appropriate time to do so and ensure someone would be available to cover my shift."

"I did want to talk with you about that. I have a pre-planned/paid for vacation from X date to X date two months from now. Would that be a problem?" In most situations, it will not be, and the interviewer would prefer to know ahead of time before you are hired.