An alien is hiding ... the rock.
behind
The ball is ... the box.
on
The girl is reading ... the tree.
under
Welcome. Come ... the house.
in
There's a tree ... the house.
by
A tiger is ... a cat.
next to
Let's relax ... the fireplace.
by
There are a lot of books ... the shelf.
on
The family is sitting ... the table.
by
A woman is standing ... the sea.
in front of
She's puttng a napkin ... her lap.
on
The kitten is sitting ... the box
in
Throw the litter ... the rubbish bin.
in