题目内容
The president ______ the sovereignty and independence of the new republic.
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These textbooks are interesting since vivid and full-color illustrations are provided to help ______ the written words.
When the job hunters are applying for a job, they usually ______ the application forms before attending an interview.
The research result seems to ______ a major US study reported last February.
He was very hard-working and ______ to his research.
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