ex. edit the paragraph : Once upon a time of all good days in the year, on Christmas Eve, old Scrooge sat busy his office. It cold, dark, wintry weather; he could hear people the streets walking up down, stamping their feet on the road keep themselves warm. The city clock just struck three, but it was dark already; it had no light all day. The door of his office was open that he could keep an eye on his clerk.