你所在的学校开展了以“成长的烦恼”为主题的综合性学习活动，请你参与并完成下列任务。

Dear Pet,
   Without knowing more about you, it's hard for me to give you some good advice.
   But first, I am sure that you are1 . You said that nobody would care if you left home. What about your2?  And other family members? It seems that you are very3 . You'd better go to a doctor or talk 4 your parents. They will be able to help you.
Second, I'm sure there’s someone else in your class who feels lonely, 5. You never know6other people feel. Try to make friends with your classmates. And you could7a club to meet new people and make friends, too.
   You8find happiness in yourself. So my9advice is to write a list of all the good things about yourself, learn to like yourself, and then10 will see your confidence (信心)and like you, too.
                                                                                                                                                                                  Editor

如图是跷跷板的示意图，立柱OC与地面垂直．以O为横板AB的中点，AB绕点O上下转动，横板AB的B端最大高度h是否会随横板长度的变化而变化呢？一位同学做了如下研究：他先设AB=2m，OC=0.5m，通过计算得到此时的h₁，再将横板AB换成横板A′B′，O为横板A′B′的中点，且A′B′=3m，此时B′点的最大高度为h₂，由此得到h₁与h₂的大小关系是：h₁____ h₂（填“＞”、“=”或“＜”）．可进一步得出h随横板的长度的变化为____ （填“不变”或“改变”）