选用框内介词填空：on in under behind over for可重复用
There are two pictures_______page 12.
The apple trees have a lot of big apples ______them.And some birds are singing____the trees.
There is a bridge______the river.
The football is _____the desk.
There are three pencils and a ruler______ the pencil--box.
My grandparent's house is ______the river.
There is a small table _______the window.
Amy is looking _______Lucy.Lucy is ______the door