B.Listen to the dialogue and choose the best answer to the question you hear (根据你听到的对话和问题，选出最恰当的答案)：(8分)
7. A) Last Thursday B) Last Sunday
C) Last Wednesday D) Last Saturday
8. A) At home B) At school
C) In the supermarket D) In the office
9. A) Mother and son B) Driver and passenger.
C) Husband and wife D) Teacher and student
