it was an old , old house , full of cupboards and passages . some of the walls were four feet thick , and there used to be queer noises inside them , as if there might be a little secret staircase . certainly there were odd little jagged doorways in the wainscot , and things disappeared at night -- especially cheese and bacon . mrs . tabitha became more and more distracted , and mewed dreadfully . while their mother was searching the house , moppet and mittens had got into mischief . the cupboard door was not locked , so they pushed it open and came out . they went straight to the dough which was set to rise in a pan before the fire . they patted it with their little soft paws--"shall we make dear little muffins ? " said mittens to moppet .
the   door was not locked .
why were moppet and mittens able to push open the cupboard ?
why were moppet and mittens able to push open the cupboard ?