1 . 阅读下列短文，根据短文内容填空。在未给提示词的空白处仅填写 一个恰当的单词，在给出提示词的空白处用括号内所给词的正确形式填空。请在答题卡指定区域作答。
When you visit London, one of the first things you will see is Big Ben, the famous clock 1 can be heard all over the world on the B.B.C. If the Houses of Parliament had not been burned down 2 1834, the great clock would never have been erected. Big Ben takes its name from Sir Benjamin Hall who was responsible for the making of the clock when the new Houses of Parliament were being built. It is not only of immense size, but is 3 (extreme) accurate as well.
