look at the green box in the middle of the room!这个句子错吗?

at the middle of还是in the middle of? in the middle of还是at the middle of 问什么句子回答是 there is a table in the middle of the room Look at the names of countries in the box below.What languag what can you find in the middle of a box in the middle of in the middle of the The letter is in the middle of the "box".What is it. He is going to put the table in the middle of the room.(对in there is a table in the middle of the room 房间的中央有张桌子 我怎么理解这个 The teacher and the student are in the class-room这个句子正确吗?如果错 in the middle of=in the centre of吗