This is our classroom and （你们的） is across the hall．
Behaving （礼貌地） costs nothing， but it brings a lot．
Now all the e﹣bike riders in Ningbo （ 必须） wear helmets while riding．
Our school （邀请） several heroes to the graduation ceremony last year．
Because of the COVID﹣19， only a few （市场） were open in our city last spring．