The first sentence is correct bc the semicolon divides two independent clauses while replacing a conjunction
I think it’s “Please, sit down, before the teacher arrives.”
Answer: according to the text called " Women in space, part two". The task that preceded the release of the orbiting laboratory was the deploying of it as soon as the two comsats had been released by the Dr. Ride who was the person in charge of doing it.
It is present because they are watching the movie right now.
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