Did you--- the windows before buying the curtain?

Did you--- the windows before buying the curtain? before the curtain r-------- ___the windows before you leave the classroom. ---------(close)the windows before you leave the classrom. ------the windows before you leave the classroom.(please),谢了 Remember ______(shut) all the windows before you leave Be ----to close the windows before you leave. I____(close)the windows before I leave. ( )1.—How much did you ____ buying the new bike? （ ）1.—How much did you ____ buying the new bike?—Three hundr Before you leave the lab,the doors and windows _shut in case Close the windows before you leave the classroom.为何Close用原型,