5. A heavy shower prevented them from finishing their game of tennis.
-> They were

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They were getting ready to head out to the tennis court, unaware of the weather conditions. Just when they finished packing and changing, They headed out to the tennis court and started playing. Not long after the first game It started to down pour and they rushed home, saddened. A heavy shower prevented them from finishing their game of tennis.

Explanation:

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not concrete, existing in thought or as an idea but not having a physical or concrete existence

- "the basic difference between keywords and subjects is that subjects (or "subject headings") have been predetermined, while keywords have not. a keyword is an easy place to start because you can use any word that seems to fit your search; this is called "natural language" searching."