Is the backpack on the floor No,it is 改错

It is on the floor his backpack is on the floor.划线提问 It is in the backpack? 改错:1.There is some rubbish on the floor.Could you pick up it ( )1.(The gym) (is) on (first floor) _________改错快 on the first floor of building B there什么an art room.it is no Where’s the baseball?Is it in the backpack?No,it isn't .it's My backpack is (on the chair.) on,Tv,my,is,and,under,table,the,backpack,is,it,the 怎么连成一句话 on ,floor,there,it,is,the,over怎么连成一句话 Is it on the floor?改为复数句 It is on the firs floor 改为一般疑问句