A group of robbers dug their way into the basement of a bank in Paris and emptied almost 200 private safes(保险箱).
They entered the Credit Lyonnais branch using building equipment to dig holes and destroy walls.
【小题1】 Saturday night, they tied up a security guard and spent 【小题2】 next nine hours robbing the bank.
One investigator described the robbery 【小题3】 a “professional job”. The robbers came in at about 22:00 on Saturday 【小题4】 left at 7:00 on Sunday. They entered through the basements of the neighboring building, digging through a series of tunnels and making a hole into a wall of 80 cm thick to get into the bank, 【小题5】 was having building works at the time.
When 【小题6】 left, the robbers set the place on fire to remove any trace of evidence, switching on the anti-fire system and flooding the building. Fortunately, the guard escaped unharmed.
【小题7】 is difficult to estimate the total value of 【小题8】 was stolen as only the bank’s clients(储户) know the content of their private safes.On
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(答案→)On
解析：一群抢劫犯挖了地下通道到巴黎银行的地下室，清空了近200个私人保险箱。他们进入法国里昂信贷银行分行运用建筑设备来挖洞破墙。这些人把一名保安捆起来，然后用接下来的九个小时抢劫了该银行。抢劫犯在周六大约二十二点进入银行，然后在周日大约七点的时候离开。离开时，这些抢劫犯放火烧了这个地方来消灭任何作为证据的痕迹。很难估算全部的被盗物品的价值因为只有该银行储户本人才知道他们的私人保险柜里头放的是什么。
【小题1】在具体的某一天的上午、下午和晚上要用介词On。On Saturday night 意为：在星期六晚上。
【小题2】在这里用the表特指。they tied up a security guard and spent the next nine hours robbing the bank.他们把一名保安捆起来，然后用接下来的九个小时抢劫了该银行。
【小题3】as在这里意为作为。One investigator described the robbery as a “professional job”. 一名调查人员把此次抢劫说成是“专业人员干的工作”。
【小题4】The robbers came in at about 22:00 on Saturday and left at 7:00 on Sunday. 抢劫犯在周六大约二十二点进入银行，然后在周日大约七点的时候离开。用and 表示动作的先后关系。
【小题5】which was having building works at the time. （银行当时在修建工程）为非限制性定语从句，which为关系代词，代替前面的先行词the bank，作从句的主语。
【小题6】When they left, the robbers set the place on fire to remove any trace of evidence，离开时，这些抢劫犯放火烧了这个地方来消灭任何作为证据的痕迹。用they指代后面的主语the robbers 。
【小题7】It 代替后面的动词不定式作形式主语。It is difficult to estimate the total value 很难估算全部的价值。
【小题8】It is difficult to estimate the total valueof what was stolen as only the bank’s clients(储户) know the content of their private safes.很难估算全部的被盗物品的价值因为只有该银行储户本人才知道他们的私人保险柜里头放的是什么。what was stolen 是介词of的宾语从句，what在该从句中作主语。