Li Lan had an American friend Susan. They usually had lunch together and Li Lan often asked Susan for advice on problems she faced adjusting to American society. Susan gave Li Lan a lot of advice and helped her to improve her English. Once Li Lan needed urgently a big sum of money to pay her tuition fee. Since she has no other friends in the States, she turned to Susan for help and promised that she would return the money soon. To Li Lan’s great disappointment, this time Susan didn’t seem happy to lend the money to her. Though Li Lan returned the money as she promised, they didn’t get along well from then on. Question for discussion: How would you explain Susan’s behavior toward Li Lan?