阅读下面的短文并回答问题，然后将答案写到题后的横线上（请注意问题后的词数要求）。
[1]Reading is often quite helpful to high school students in crisis（危机）. Whatever crisis someone is experiencing, there is probably already a book about it that will help the reader feel less alone.
[2]Teenagers are in crisis in so many different ways now. They are experiencing stress as parents lose jobs in a financial crisis. They are under pressure to find a way to pay the tuition（学费）when they get accepted to college. Also, they may become hurt by betrayals（背叛）of friends.
[3]Teenagers often feel alone in their problems; they act like they are the only person on the planet who has experienced the problem.
[4]Modern literature is often very helpful for teenagers. It helps teens to read about other people who have had a serious crisis in life and gone on to achieve their dreams and a good life.
[5]Literature thus helps teens move out of their minds and their fears and into the larger world. Reading literature helps teens to realize that everyone has to deal with serious problems along the path of forming an identity, choosing a career, leaving their hometown for college, and every other crisis a teen may face.
[6]For us teachers, it is helpful to tell the students that for whatever problem _____________, someone may have already written it in a book. Ask the class to share the problems, and try to find a book that has addressed each one, Literature include many universal themes. Once students realize that, they may become interested in spending more time in the library finding books they relate to. Once they use literature to gain help during difficult times in life, they will realize that reading is really a wonderful way to learn more about life.
What is the main idea of the passage? (no more than 8 words)
                                                      
Fill in the blank in Paragraph 6 with proper words. (no more than 5 words)
                                                       
List three different things that may bring stress to teenagers. (no more than 10 words)
①                                                      
②                                                      
③                                                      
What makes literature helpful in helping deal with crisis? (no more than 5 words)?
                                                          
What does the word “it” (Line2, Paragraph 1) probably refer to?(no more than 6 words)