题目内容
I got from him only a letter, which was put on my office desk; ______to the receipt of this letter I have never heard from him.
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The duties to provide services for children in need are not ______to the local social services department.
We pray that all nations be ______and that all people around the world live in peace.
He suggested a small but ______improvement on our former plan; I really appreciate it.
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