阅读下面短文，并用英语回答问题(请注意每小题的词数要求)。
Eyes Always on Us
Video cameras are everywhere：schools, theatres and stores. But in recent years, they have entered our homes. Many parents set up cameras at home to watch their children’s online classes and homework. Are cameras really helpful? What do students think about them?
Li Ming
Earlier last year, I liked to lie in bed and watch videos instead of studying. This affected (影响) my studies and made my grades worse. So my parents set up a camera to keep an eye on me. It worked. With the camera watching, I had to do my homework first and make plans for studying at home. When I was alone at home, the camera made me feel safe because I knew that my parents were watching on the other side. My grades improved a year later.
Zhang Hua
When I was in Grade 8, my parents set up a camera in my room. I really didn’t like it because I felt like there were always eyes watching me. I felt so uncomfortable that I couldn’t sleep well at night. Knowing there was a camera around, when my friends came to my home, they would speak quietly and carefully. We couldn’t have pillow fights. I was sad. So I asked my parents to take the camera away. They agreed as long as I promised to try my best to study well. I feel happy and free now.
1. What does the underlined word “they” in paragraph 1 refer to? (不超过5个词)
2. What happened to Li Ming one year later? (不超过5个词)
3. What did Zhang Hua’s parents agree to do? (不超过10个词)

1.Video cameras.
2.His grades improved.
3.They agreed to take the camera away.