сумма и разность чисел: 9 и 7 , 8 и 5, 10 и 3 , 7 и 7

Помогите подобрать нужный предлог  Английский  язык:

1) There are two desks next  / to / in / on/  the  window.

2) There is no pantry  /on / in/ at/ his flat.

3) There is a nice carpet  /at / on / in/ the floor.

4) I share a large room / of / from/ with/ my brother.

5) There are many interesting books / at / on/ in/  the shelf.

Заранее спасибо)