情景选择。 1. 招待客人随便吃该说: [ ] A. Help yourself. B. Thank you. 2. 表示感谢时说: [ ] A. The same to you. B. Thank you. 3. 晚上告别说: [ ] A. Good evening. B. Good night. 4. 给别人做示范时说: [ ] A. Let me show you. B. Let me try. 5. 当你想帮别人说: [ ] A. Can I help you? B. Can you help me?