Answer:
¿Usted conoce a mi vecino?
Explanation:
<em>Saber</em> is to know a fact and <em>conocer </em>means to be familiar with something/someone. In this case, <em>conocer</em> is used to say if you know someone.
<em>Hope this helps!</em>
Answer: I think that you were suppose to complete the sentence. So instead of saying "No hay muchos." You were suppose to say "No hay muchos estudiantes en la Nebrija." I hope this helps. :)