根据短文理解, 从A、B、C、D四个选项中选择最佳答案填空。

    My friend John is a student. Last year, he went to Japan and stayed there  1two months. I was2 that John was able to 3such a long holiday in Japan because he was 4  . "How did you get so  5  money, John?" I asked. "I thought you could stay in Japan for 6  two weeks." "It was easy," he answered. "I got a job in Japan." "A job? What did you do?" "I gave English lessons  7  a shop owner, and we became good friends." "But you are8  teacher!" "Mr Tanaka, the shop owner, knew l was not a teacher, but he said he had a lot of American customers, so he wanted to learn English. I spent three hours a day 9  to him. In return, he gave me a room, three meals a day and some money."

    "Did he learn 10 English?'' "I don't know," John said, "but I learnt a lot of Japanese."

    楚昭王遭阖庐之祸，国灭出亡，父老送之。王曰：“父老反矣！何患无君？”父老曰：“有君如是其贤也！”相与从之。或奔走赴秦，号哭请救，竟以复国。

    汉高祖入关，召诸县豪杰曰：“父老苦秦苛法久矣，吾当王关中，与父老约法三章耳。凡吾所以来，为父兄除害，非有所侵暴，毋恐！”乃使人与秦吏行至县乡邑，告谕之，秦民大喜。已而项羽所过残灭，民大失望。刘氏四百年基业定于是矣。

（节选自《容斋随笔》，有改动）

【注】楚昭王遭阖庐之祸：指吴王阖庐伐楚，五战，楚王败。