1．She asked me whether I had seen him the night before．（改成直接引语）

She asked, “___1_____ ____2____ see him ____3_____ ___4_____?”

2．My mother said to me: “Come back before 10．” （改成间接引语）

My mother ___5____ me ___6________7______ ___8______ before 10．

3．It was a very difficult period of my life．At that time I first met Nelson Mandela． （连成一定语从句）

_____9____ ____10______ ___11_______ I first met Nelson Mandela was a very difficult period of my life．

4．All hope was not lost．（写出同义句）

___12____ ____13____ ___14_____ was lost．

5．He prefers riding a bicycle to riding on a crowded bus．（（写出同义句）

____15____ __16_____ _____17____ on a crowded bus, he prefers to ride a bicycle．

6．We seemed to be able to see for miles at one point．（用it作形式主语改写）

___18_____ ___19_______ ___20_______ we were able to see for miles at one point．

66. ____ ____ ______ ______(人们相信) greenhouse gases are the main causes of global warming.

67. The house which_______ _______ ______ ____________ (状况欠佳) will be repaired soon.

68. 他的成功应该归功于他的努力学习。

He _______ ________ _________ ________ his hard study.

69. You are likely to make great progress in your study. (用it作形式主语改写句子)

  _____________________________________________________________________.

70. He did not return to his hometown until 2008. (强调划线部分)

  _____________________________________________________________________.

71. We can’t accept the truth. She is the mother of six children. (用同位语从句合并句子)

______________________________________________________________________.