题目内容
______unstable and explodes as a supernova is not known.
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______composed traditionally has been a subject of debate among scholars.
______that the professor's strictness with him is not to punish a careless student but to teach him how to be precise.
The mountain was______ many animals, such as wolves, foxes and rabits once haunted but now it is so silent.
The reason we're so late is______.
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