He was afraid (report)____it to the police; he didn't think they'd believe him.
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The crowd was so (noise)____that few people heard what the speaker said.
The little girl has a (remark) ____ memory.
If we (know) ____what the future would have in store for us, some of us would be more confident.
When used to cut meat the knife needs (sharp) ____from time to time.