41. 彼得一直没有来的原因是他没赶上这班火车。(catch)

42. 他认为每次考试作好准备是重要的。(it)

43. 学好一门外语需要时间和努力。(effort)

44. 如何解决这道难题将在明天的会上讨论。(solve)

45. 对学生来说，把座位让给这位老年妇女是礼貌的。(polite)

46. 与汤姆打赌是没有用的，因为他永远不会改变他的想法。(no use)

47. 我宁可失去这场比赛，也不愿意伤害他。(would rather)

48. 除了请医生外，似乎没有别的事可做。(nothing but)

49. 据说这本书已被译成好几种外语。(translate)

50. 爱伦今天上午缺席，因为她要去补牙。(have sth. done)

41. The reason why Peter hasn’t come is that he didn’t catch the train.

42. He thinks it important that he does full preparation before the examinations every time.

43. Learning a foreign language well requires time and effort.

44. How to solve the problem will be discussed at tomorrow’s meeting.

45. It is polite for the student to give up his seat to the elderly woman.

46. It is no use debating with Tom, because he will never change his mind.

47. I’d rather lose the game than hurt him.

48. There seemed nothing else to do but send for a doctor.

49. It is said that the book has been translated into several foreign languages.

50. Ellen was absent this morning because she had her tooth filled.

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