转换句子

This is the best voice I’ve heard．

________________

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It is ________ for me to work out this problem．(我十分钟做出这个题目是不可能的。)

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It ________(对我们来说相当困难)to get a correct reading from the quadrant as the boat moved constantly．

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They believed that it ________ if cars weren’t allowed in the city centre and only bicycles were．(他们相信如果不允许汽车只允许自行车进入市中心会对每个人都有好处。)

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The new law doesn’t ________ land used for farming．(新法与耕地无关。)

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If you don’t know what this means, ________ the dictionary．(如果你不知道这是什么意思，就查字典。)

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You know who I’m ________．(你知道我指的是谁。)

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The victims were not ________ by name．(罪犯没有被提到名字。)

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That problem is obviously a bit troublesome but he is still trying to ________．

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After a long time calculating he ________ a sum．