the door ______open.I had locked it myself and the key was i

I remembered that I (had to)lock the door and so I locked it when I locked the door,（）I realized i had left my key on the 几个英语问题,求详解1.—The door was open.—It --------open．I had locked when I locked the door,I realized I ( ) my key at home. I tried opening the back door,but it was locked,too.其中lock为什 Have you locked the door?—___.Shall I go and lock it now I got into a ____ when I found the door was locked. I saw him ___the key ___the lock,turn it and open the door A I lose the key to the door. now 这里用法?I had left it on a chair beside the door and now it I had left it on a chire beside the door and now it wasn't t Sorry,I can't open the door,for I ( ) the key to it.