①Lanlan sits______the left hand side in the classroom. 中间填什么?

①Lanlan sits______the left hand side in the classroom. 中间填什么?
以及：②There are a lot ofpictures __________ the wall.
③：You must go to school _______time.
④:Let's meet________the school gate.
⑤:Li Ping sits next ________me.
先到这里