I’m practicing the past tense and I would like to know if these sentences are correct:

You were in my house that night.
They did exercices for two hours in the gym.
Leonel and his friend went to the coast of Havana.
She paid the water bill.
The people believed that the illusionist did real magic.
Karla put her Spanish books on the table.
You knew all the truth that day.
I had to run very fast to not get wet.

Thank you in advance

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Note: You can also say “They exercised for two hours at the gym”