What excuse does Bakha give for not bringing more food home, and how does his father's reply make him feel?

Bakha tells his father that he did not call at many houses, because he does not know the people in town very well. When Lakha tells him that he must get to know them, because once Lakha dies, it will be Bakha's responsibility to sweep in town, Bakha thinks about the future stretching before him and feels despair.