W: It's all very well to say that, but someone cones to the door and says" electricity "or "gas" and you automatically think he is OK, especially if he shows you a card. What was said before this conversation?
Ans: M: It's partly your own fault. You should never let in anyone like that unless you're expecting him.

M: I worked at a restaurant the whole vacation. It was an exciting experience and I also made enough money for the next term. What did you do in your summer vacation? W: I attended some classes because I fell behind the others last term. I wanted to catch up with them. M: You are great. So have you seen David? W: He dropped out of school completely. M: Really? Why? I haven't seen him for several months. W: He worked at a good company as an assistant and since he did well, they asked him if he wanted to work full time. M: Wow. He's so lucky. He doesn't have a degree and he already has a job. W: It sounds good now, but I wouldn't have done that. I want a degree. What was said before this conversation?
Ans: W: Hi, Mark. How was your summer vacation?

M: Yeah, Laura. I'm going for a ride around the Qinghai Lake on Saturday, but it depends on the weather. W: According to the forecast, it'll be cloudy the day after tomorrow, good for a ride. M: Great! Do you go riding often? W: Absolutely. I go as much as I can, because we can really get in touch with nature. It would be nice to get out of the city. Do you want any company? M: Sure, but it will be a 30-mile ride. Have you been riding so long before? W: Yeah, I go a lot too. I even saw a bear and some monkeys on my last ride. My friend Mike and I rode more than 30 miles to a very wild part of the national forest. M: Wow! You must have been pretty far away from the city. Shall we invite him to go along? W: Of course. I'll ask him. M: Thanks. We will have a good time this weekend. What was said before this conversation?
Ans: W: Have you any plan for the weekend, Tom?

W: I'm sorry. I'm a stranger here myself, but if you cross the road and ask in the police station which is beside the supermarket, I'm sure they'll help you. What was said before this conversation?
Ans: M: Excuse me, could you please tell me the way to the city library?