Our classroom is on the third floor. Theirs is here.
答案:Theirs
解析:这里考察名词性物主代词,这里的theirs相当于their classroom.
it
首先,理解这句话的含义:我们的教室在3楼。到了。
其次,第二句缺主语,从前一句中可以看出,主语应是our classroom,是可数名词单数,所以,不用they等。it is here,直译是,教室在这,指教室的地理位置。
不用he she,是因为教室是物,非人。若用he或she,eg:where is Lee? he/she is there.
they,them,their等,当主语是复数时使用,后面搭配的是are,而不是is
答案就填 It.
首先,空格处缺少主语,其次,可以用it指代Our classroom。