An alien is hiding ... the rock.
behind
The family is sitting ... the table.
at
A woman is standing ... the sea.
in front of
There's a bridge ... the river.
over
The kitten is sitting ... the box
in
The cake is ...
on the right
The people are sitting ... each other.
opposite
There are a lot of books ... the shelf.
on
The girl is reading ... the tree.
under
There's an armchair ... the window.
next to
The ball is ... the box.
above
There's a bookshelf ... two beds.
between
There's a tree ... the house.
near
There are nice flowers ...
on the left