_______ difficulties we may com across, we'll help one another to overcome them.

阅读理解
    Do you know some world famous brands (品脾), such as Nike, adidas, Kappa...？ What do you think of them？ Do you use their products(产品)？ Here are some students' opinions:
Sam: I am a Nike fan. Many of Nike's advertisements are fun and its products are great! I have a pair of Nike basketball shoes.
Joe: In my eyes, top brand means high quality, So I love top brand products though they're very expensive. I was glad Mum bought me a Kappa T-shirt last month.
Sally：The logos(标识) of famous brands are usually unique and nice. It's cool to own products with those logos. Sometimes I wear my adidas coat.
Jack：Many top brand products are advertised by spokesmen(代言人). I love the spokesmen of many top brand products. I've got many Nike socks.
Susan: I know it's popular for young people to have famous brand products these days. But my parents both lost their jobs. I have no interest in following the fashion. I only choose the products that are not expensive.
Adam: As a student, I don't earn money myself. It's not easy for my parents to support me. So I only use some ordinary products. I don't agree students use the famous brand products.

在盐城某中学就读的两名女生小雨和小慧，因为一点小事而大打出手。原本是同学之间的小矛盾，小雨竟然找来校外的两名女学生，对同学小慧围殴3小时，给自己和他人造成巨大损失。这材料启示我们，当同学之间发生矛盾后，我们应该（  ）
①冷静、理智地处理问题，切忌用拳头代替说理
②学会换位思考，善于站在对方的角度感同身受，推己及人
③与人为善，尊重他人，宽容他人
④不做有损自己和他人人格的事情

已知等比数列{a_n}中，各项都是正数，且 $a_1，\frac{1}{2}{a}_3，2a_2$ 成等差数列，则 $\frac{a_8+a_9}{a_6+a_7}$ 等于____．

不是每一朵花都能结出果实，能结出果实的花一定（　　）

①长有雌蕊和雄蕊 ②长有雌蕊  ③经历了自花传粉  ④经历了传粉  ⑤经历了受精．