help me with formal writing.

Answer:
There were a lot of people at the museum
Oscar started to worry about the test
When the cops arrived, the criminal ran outside
He checked his cell phone for any messages
Converting the words from informal writing to formal writing would be:
A formal writing has to do with language or diction which is used among people who the speaker is not very close to and is used in official occasions.
With this in mind, we can see that some of the words in the image such as "cop", "crook", "Ain't", etc are all informal words which should be changed to more formal ones.,
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