the classroom building has 4 building store heights是什么意思

I see two( )putting out the fire at Sunny buildI see two( )putting out the fire at Sunny building clean the classroom 保持-------the classroom clean. The computer lab is on the（）（two second）floor.There are（）（three third）floors in this buildi是building the backboard is()()()()the classroom he has cleaned the classroom 对 cleaned the classroom提问 learning outside the classroom 和 learning inside the classroom. Mark likes reading in the classroom.(in the classroom)提问 In the classroom,I sit___Tom Some students [ ] in the classroom let is clean the classroom? who ____(clean) the classroom? Wendys at the classroom door . i must____(clean) the classroom. come out of the classroom let's d____in the classroom What in the classroom?回答 what,s in the classroom?