The door is open.I forget （填closed、close或to close）it.

to closeforget/remember to do sth。忘记/记住做某事Don't foget to close the door。别忘了关门 Remember to colse the door!记住关门!forget/remember doing sth。忘记/记住做了某事I forget closing the door。我忘了已经把门关上了。I remember closing the door。我记得已经把门关上了。