在“世界屋脊”青藏高原上，修建了____、川藏、____、青藏四条公路干线，被藏族同胞称为“幸福的金桥”．

材料一：自1840年以来，西方列强先后发动了一系列侵略中国的战争，以武力强迫清王朝签订了一个又一个不平等条约，侵占中国的领土，蹂躏中国的主权，掠夺中国的财富，使中国一步一步地沦为半殖民地半封建社会。

材料二：农历2009年二月初二凌晨，在法国佳士得拍卖公司举行的拍卖会上，圆明园文物——铜兔首、铜鼠首被中国厦门商人蔡铭超分别以1 400万欧元拍得，但蔡铭超“拍而不买”，拒绝付款。

请回答：

先化简，再求值：﹣6x+3（3x²﹣1）﹣（9x²﹣x+3），其中 $x=-\frac{1}{3}$ ．

下列词语中没有错别字的一项是（   ）

Complete the following passage with the words or phrases in the box. Each word can only be used once (将下列单词词组填入空格。每空格填一词，每词只能填一次

    My mother was a housewife. She thought that successful people spent a lot more time ____  than watching TV. So she asked my brother and me to read two books every week in our free time. She would check them with marks, ____  she couldn't read the books at all.
    When I went to school, I was an A-student, but not for long. I wanted cool ____  and hung out with friends. I went from being an A-student to a C-student, but I didn’t care. One night, I complained about not having enough Italian T-shirts. Then my mother gave me all her money. She said I could get the money ____  to buy shirts if I finished buying all things the family needed. I was very ____  that, but after I bought those things, there was no money left. I got to know how ____  it was for my mother to do all this. I went back to my studies and become an A-student again. Finally, my dream ____  and I become a doctor.
    My story is really my mother’s story--a woman with little education greatly changed my life as a ____ . So, I believe there is no job more important than parenting.