Which of these formats we use a heading subheading and short paragraphs? Letter

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Proofread the following sentence and correct the spelling and grammar errors. there are two errors. go through reception and turned right at the l entrance.

Pls needs hypehen or no hyphen 1. after serving as principal for ten years,mr. jones will resign this year 2. it's sixty seven degrees outside and it's only february!

American history (is, are) studying the american colonies.