单项选择题

We must try our best to protect some of the（）cultural treasures.

A. rare
B. precious
C. valuable
D. worthy

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单项选择题
They insisted on（）at home.

A. that I stay
B. me stay
C. that I should stay
D. my staying
单项选择题
We can't go into all the details of the case now; I merely mention it（）

A. in no case
B. by the way
C. for a start
D. at a time
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