听下面一段材料，回答第1-4题。 1. What's the problem of some of the university students?. A. They don't spend all their time on studies. B. They don't know what to do with their free time. C. They don't have choices for outside class activities. 2. How is the students' high school life? A. Controlled and busy. B. Regular and colorful. C. Active and independent. 3. According to the speaker, what is the role of outside class activities at university? A. To make students healthier. B. To improve students' test scores. C. To enrich students' experience. 4. What does the speaker advise his students to do? A. Learn to enjoy themselves. B. Learn to be their own masters. C. Learn to develop their potential