76．He didn’t know he __________ (own)the new computer already．

75．当我到达火车站的时候，火车已经离开了。(by the time)

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74．在过去的l2个月里，他举办了3场大型演唱会(have had)

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73．这些年轻人几乎一点汉语都不会说，并且以前从没来过中国。(hardly, never)

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72．我正期待找到更多关于我的根源的事情。(look forward to)

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71．你还没有收到她的信吗?(hear from)

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55．Some kinds of animals are getting fewer and fewer. So we must do something to save the　　 __________(濒临灭绝的) animals.

54．The scientists have learnt a lot from _______ (科学)studies．