题目内容

I__________these books for three years.

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—Hello, Alice. You__________very happy.
—Yes. I am happy. My parents are coming to see me tomorrow.

Will the woman open the window？

The scientists told people to use Internet less.

根据下列文章回答 21～25 题：
第 21 题 Details of the private life of an astronaut are hard to come by，because they are__________．