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In my opinion it;s because adults have a too big of an ego. They wall around with the impression that they're older and know more and we should just listen to them because of that. They feel the need to boss kids around. This affects the teenagers in a way that they get real bad attitudes and in some form, this is peer pressure. They no longer feel comfortable to talk or associate with their parent or any adult. <span />
Answer:
i finished the work i was doing
it starts with details and uses them to support a more sweeping statement
Hadn't been, is the same as "had not been"
inside the sentence, It <em>had not been </em>until the Fourth Dynasty that the most famous pyramids were built, had not been does not fit inside (it doesn't make sense).
Wasn't works, because wasn't is the same as was not
It <em>was not </em>until the Fourth Dynasty that the most famous pyramids were built.
This works as it creates a normal sentence
hope this helps