Answer:
The wrong answers are : un élève (wich means a student, not a school supply)
une fenêtre (wich means a window)
un prof (wich means a teacher)
une porte ( wich means a door)
So you could say, "voici un stylo, un cahier, une gomme et une crayon"
These are the correct answers (:
Btw, I'm french, hope you'll undersatnd and hope I understood correctly your question