填合适的介词 There is a beautiful bridge ____ the river.Let's walk ____ the beach.
There is a beautiful bridge ____ the river.
Let's walk ____ the beach.
Why not go to the park ____ a sunny day?
My shoes are ____ the bed.
Look,the bookshelf is ____ the door.
Our teacher wants to put up a map ____ China on the wall.
There is a middle school ____ the left.