(1)After having lived for over twenty years in the same district, Albert Hall was forced to move to a new neighborhood. He surprised his landlord by telling him that he was leaving because he could not afford to buy any more chocolate.(2)It all began a year ago when Albert Hall returned home one evening and found a large dog in front of his gate. He was very fond of animals and as he happened to have a small piece of chocolate in his pocket, he gave it to the dog. The next day, the dog was there again. It held up its paws (爪子) and received another piece of chocolate as a reward. Albert called his new friend "Bingo". He never found out the dog's real name, nor who his owner was. However, Bingo appeared regularly every afternoon and it was quite clear that he liked chocolate more than bones. He soon grew dissatisfied with small pieces of chocolate and demanded a large piece a day. If at any time Albert couldn't give it, Bingo got very angry and refused to let him open the gate. Albert was now
Albert had to "buy him" means __________