19.If you are walking away from a clock tower, you will hear the ticking of the clock fade to point_it cannot be heard.

57. 金属有许多有用的特性 , 其中强度是最重要的。

40.What is the main idea of the passage ？

26.He_to see you yesterday, but he had an important meeting to attend.

34.I must decline it because the conditions you offered are not_.

58. 许多美国人依靠信用卡生活 , 他们的生活质量用他们能够借到多少钱来衡量 , 而不是他们能够挣得多少。

22.When Mr.Smith got there, he found that about_of his friends had arrived.

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43.What did the young man usually have at a restaurant ？

30.California relies heavily on income from fruit crops, _.

62. 不论她如何说 , 我也不相信这个消息。

63. 不管发生什么 , 他们都将完成这个试验。