通读下面短文，掌握其大意，然后在每小题所给的四个选项中，选出一个最佳答案。
Jim is a well-behaved boy. He 1 had an argument with his parents before. But when this boy became a ninth-grader, things began to 2. He said, "Now, I often argue with my parents, sometimes about something unimportant."
He might be suffering from puberty(青春期). Education experts think ninth grade is a special period for 3. They go through difficult physical and psychological changes during puberty.
A recent survey by the National Institute of Education Science shows that the lack(缺乏) of support from parents makes the situation even 4. Meanwhile, the 5 also shows that as ninth-graders reach puberty, they want to be more independent. As a result, about 80 percent of ninth-graders and their parents always have different opinions. Jim had the feeling deeply. "I thought I was an adult already. I can make 6 by myself, but most of the time my parents disagree with me," he said. 7, he thinks there is nothing wrong with hanging out with friends at night. But his parents don't 8 him to do that.
To 9 these problems, an expert has given tips to students. First, talk with your parents. Sometimes, they may not fully understand you, but keep trying. Second, calm down and focus on your studies. Finally, learn about these changes and get to know yourself through reading and other things. Then try to 10 your emotions(情绪).