题目内容
The missile is designed in such a way that once ______ nothing can be done to retrieve it.
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We have done things we ought not to have done and _______ undone things we ought to have done.
What a good listener is able to do is to process what he hears on the basis of the context ______.
When ______ through a telescope, the sun appears darker near the edge.
While _______ the sun, the satellite has sent more than four billion bits of information back to earth.
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