Answers:
1. The computer is on top of the table.
Translation 1: El ordenador está encima de la mesa.
2. The chair is behind the desk.
Translation 2: La silla está detrás del escritorio.
3. The books are next to the window.
Translation 3: Los libros están junto a la ventana.
4. The book bag is in front of the door.
Translation 4: La mochila está delante de la puerta.
5. The waste paper basket is next to the desk.
Translation 5: La papelera está junto al escritorio.