帮帮忙填入适当的介词there are some apples什么the tree.there is a bird什么t

There are some apples in the tree.There is a bird on the tree.There are many nice books on the shelf.There is a clock on the wall.There is a window in the wall.The bike near the tree is mine.There are...

There are some apples on the tree.
There is a bird in the tree.
There are many nice books on the shelf.
There is a clock on the wall.
There is a window in the wall.
The bike under the tree is mine.
There are four trees in front of the house.

in
on
near
in front of