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阅读下面的文章，根据语篇内容，用恰当的词完成题后表格中所缺单词。(每格限填一词)
An Event of Imagination
The year is 2094. It has been announced that a comet is heading towards the Earth. Most of it will
miss our planet, but two pieces will probably hit the southern half of the Earth.
On 17 July, a piece four kilometers wide enters the Earth's atmosphere with a massive explosion.
