读课文《廉颇蔺相如列传》，下列句子分别编为四组，全都反映苏秦合纵成功的一组是（）

①乃见说赵王于华屋之下 ②赵王大说，封为武安君，受相印 ③苏秦相于赵而关不通

④式于政，不式于勇 ⑤转毂连骑，炫煌于道 ⑥清宫除道，张乐设饮，郊迎三十里

   How are you, Lin? I’m writing1 you at my school. It’s a big middle 2. I’m in a big class. There’re fifty students in my class. There are about two hundred teachers in my school. My  English teacher 3 Miss Liu. 4 is a nice teacher.
   We go to school 5 Monday to Friday. There are four classes in the morning and two in the afternoon. We play games 6 four on Friday after class.
   I have some friends at school. One is 7 America. She speaks English and 8Chinese. I like to play 9 them. We 10 football. That's my favourite game.

以下事件中，改变了社会性质的有
①商鞅变法        ②王安石变法   ③穆罕默德·阿里改革   ④1861年改革

我国古代哲人老子曾经说过：“轻诺必寡信。”意思是说一个人过于轻易地答应别人一件事，就必定没有足够的信用。没有信用的人，很难得到他人的信任，就不会有朋友，也不会有事业上的成功。这说明：（   ）