Accept
It was hard for Xavi to *accept* that he didn't win first prize for the Monroe Science Fair
The word that best completes the sentence is "accept". So, it's A.
A sentence may be defined as a collection of words that makes complete sense.
"It was hard for Xavi to accept that he didn't win first prize in the Monroe Science Fair".
Therefore, the correct word is accept.
To learn more about Sentence, refer to the link:
https://brainly.com/question/11352260
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