有奖请教一道小升初英语改错题,改错.下面短文中,标有序号的句子中有一处错误,请找出并改正.26.This's Sam's

有奖请教一道小升初英语改错题,
改错.下面短文中,标有序号的句子中有一处错误,请找出并改正.
26.This's Sam's room.27,You can see some things in the room.There is a bed in it.28,There is computer on the desk,29.some CDs are next to the computer.30.There are two chair in this room and a sofa is between them.
26._______ 27.________ 28._________ 29._________ 30.______