题目内容
______ was the "curiosity" of all mankind to explore the unknown.
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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.
______the students think it their duty to study hard has laid the foundation for the university's high reputation.
______ theories approximate the truth is the day-to-day business of science.
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