题目内容
The duties to provide services for children in need are not _______ to the local social services department.
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He suggested a small but ________ improvement on our former plan; I really appreciate it.
The ________ conference which I attend every year is going to be held in London in January next year.
The secret agent promised that the information he _________ was obtained from reliable sources.
Whether ________ or professional, American football is perhaps the most popular sport in the US. It attracts a total attendance of over 40 million and is watched by many more millions on television each year.
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