1. 道别：23 Polite Questions礼貌提问 | 24 Farewells道别 | Negotiation谈判

2. 三、告别：二、介绍Introductions | 三、告别Farewells | 四、感谢和应答Thanks and responses

3. 离别：1.3 Talking on the phone 打电话 | 1.4 Farewells 离别 | 1.5 Invitations 邀请