37.Who will most probably take care of the middle-aged Americans when they need care themselves ？

32.He apologized_having to leave so early.

40.What is the main idea of the passage ？

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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.

42.The young man was not found to be illiterate until_.

23.Jack worked late into the night, _he had not finished even half of the job.

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

20._suggestions you make, he will turn a deaf ear to them.

57. 金属有许多有用的特性 , 其中强度是最重要的。

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

18._before we leave the day after tomorrow, we should have a wonderful dinner party.