听对话，回答问题。
1. Where are they going to have their lunch?
A. At school.
B. At the foot of the hill.
C. On the top of the hill.
2. When will the bus leave the park?
A. At 10:30.
B. At 2:00.
C. At 4:00.
3. How long will the whole activity last?
A. About four hours.
B. About five hours.
C. About six hours.
