12. Complete the paragraph

He was a round little man with a red face and a whole box of with and . He smiled at Margie and gave her an apple, then took the apart. Margie had hoped he wouldn’t know how to put it together again, but he knew how all right, and, after an hour or so, there it was again, large and black and ugly, with a big screen on which all the were shown, and the questions were asked. That wasn’t so bad. The part Margie hated most was the slot where she had to put and . She always had to write them out in a punch code they made her learn when she was six years old, and the mechanical teacher calculated the in no time.