聽對話，回答問題。
1. How many hours a day does David work at the moment?
A. 8 hours
B. Less than 10 hours
C. More than 10 hours
2. What is the reason for David's trouble?
A. Too much sleep.
B. Too much work.
C. Too much exercise.
3. What is the idea the doctor gave him?
A. Eat more and work less
B. Eat more healthy food and do more exercise
C. Have a good rest for four weeks
