No hay nada encima de la mesa. If you sound it out, it could either be "nada" or "nadie" but if you are talking about an object, then use "nada". If you are talking about someone not on the table, you would use "nadie" Nada: for object, Nadie: for person.
Hope this helped
The awenser is they went in En carro
5- la habitación está desordenada porque no tengo tiempo de organizar los libros y papeles
6. Son las once de la noche, no puedo ir a la biblioteca ahora porque está cerrada
