题目内容
--What is that building?--______ the garden equipment it stored.
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______ the mass of the nucleus is slightly less than the total mass of the protons and neutrons which make up the nucleus.
______ was the "curiosity" of all mankind to explore the unknown.
It has always puzzled me______ the old man tied a red silk ribbon on the young tree in his courtyard.
It's doubtful______ the government of that country can accept them as permanent residents.
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