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Which sentence is correct and why?

vor 3 Monaten
1) There are three tests and EVERY lasts for one hour. 2) There are three tests and EACH lasts for one hour. 3) There are three tests and EACH OF THEM lasts for one hour.

Thank you!
each
every
grammar
english grammar

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Charles
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english
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vocabulary
grammar
biligual
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english
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exchange
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Sandra Patricia
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