Preparing for an interview for regular position in Teaching

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I was working as contract of service as office staff (administrator of the website) for more than a year in a university then i was hired as part time instructor in web development for less than a month but i am not yet teaching the students because the schedule of the classes were move for about 2 weeks it will be tomorrow . Last Thursday, my department chair told me to apply for the permanent position in teaching because they have a vacant position. I am happy when I heard it from my boss, but i was thinking "how can i become a permanent instructor, i never experience teaching in a regular classes and my stay here is shorter than any other staff and instructor who is working here longer than to me ". The screening is tomorrow and until now i don't know how can i answer if they ask me Why they promote me as permanent instructor. A little advise is appreciated. I am thinking to answer it, "When i was hired as part time instructor, i am so happy because i can share more knowledge for the students and my dream is finally come true. But when i heard you have a vacant position for permanent position in teaching, i said to my self that I wish i can apply to it or be promoted someday, some instructor told me to apply, but i never think of it right now, i want to be experience first in teaching because i am not yet prepared for that position." If this is my answer i think i will not be hired, but i want to be hired too.