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22. Not until he retired from teaching three years ago ____ having a holiday abroad.

61. 真正的友谊就像健康一样，失去了才觉得宝贵。

（  ）51. Just like love, faith and doing good for others, money is also important to our life.

( ) 12. The fish which are caught by a fisherman in South America may be made into pet food.

（  ）53. In addition to being a source of income, our jobs define who we are in the world.

16. Experiments of this kind ____ in both the U.S. and Europe well before the Second World War.

23. The letter is from my sister, ____ is working in Beijing.

62. 你是在什么时候意识到英语非常值得学习的？

33. He glanced at the envelope and ____ his uncle‘s handwriting.

49.    , drink-making techniques, equipment and packaging are exhibited in the exhibition.

36. What does the underlined word “these” in Paragraph 2 refer to?