听下面三段对话和短文，每段对话和短文后有几个小题，从题中A、B、C三个选项中选出最佳选项。听每段对话和短文前，你将有时间阅读各个小题，每小题5秒钟，听完后，每小题将给出5秒钟的作答时间。每段对话和短文读两遍。
听第六段材料，回答第6至第7小题。
6. Which day is Mary’s mother’s birthday?
A. This Saturday B. This Thursday C. This Friday
7. What are the speakers going to do to celebrate the birthday?
A. They are going to have a party in their house.
B. They are going to have a picnic.
C. They are going to have a big dinner in a restaurant.
