单项选择题
M: Excuse me, can you tell me where the bookstore is W: Yes. They are just down this street on the left side.
A. Make a call. B. Have a rest. C. Buy a book. D. Look for something.
A. worked B. had worked C. are working D. had been working
A. Wife and husband. B. Teacher and student. C. Clerk and guest. D. Employer and employee.