Short Answer
Use a comma and a coordinating conjunction to combine the sentence pairs into one sentence.
-Before the invention of e-mail, people communicated by regular mail. They often had to wait days for a reply to a simple letter.
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Q2: Use a comma and a coordinating conjunction
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Q8: Use a comma and a coordinating conjunction
Q9: Use a semicolon and a conjunctive adverb
Q10: Use a comma and a coordinating conjunction
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