5. Where does the dialogue take place?
A. In a market. B. In a library. C. In a post office.
6. Why can't Sam go home?
A. Because he is writing a letter.
B. Because he can sleep in the office.
C. Because he will have a meeting.
7. How much should the man pay for the tickets?
A. 30 yuan. B.15 yuan. C. 45 yuan.
