There is a clock ()the wal land windows are () the wall

There is a clock ()the wal land windows are () the wall
There is a clock ()the wal land windows are () the wall

There is a clock ()the wal land windows are () the wall
There is a clock ( on ) the wall and windows are ( in ) the wall.
可以这样记忆：表贴在墙表面为on,窗户嵌在墙中为in.
例句有：There are four windows and two doors in the wall.
A picture of flowers hung on the wall.