围绕本课标题 Reward for virtue 对美德的奖赏（节食失败的故事）主题，AI 老师会出 若干个简单问题，
每个问题听完后，用 完整句子口头作答。
⚠️ 尽量说完整句子，不要只说一个词；优先用本课句型与词语：has always been fat / things got so bad that / go on a diet / wrote out a long list / the foods which were forbidden / paid him a visit / as fat as ever / hurriedly hid a large parcel under his desk / It was obvious that he was very embarrassed / smiled guiltily / his diet was so strict that / reward himself occasionally / five large bars of chocolate and three bags of sweets