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

Remaining positive and letting the interviewer know 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 possible if you need sick or leave time.

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

"If I am sick, I will let you know as soon as I realize I won't be able to come in. If appropriate, I would call or text you the night before my shift. 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 about when would be an 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 a problem, and the interviewer would prefer to know ahead of time before you are hired.)