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To put two or more things into a straight line: When you've aligned the notch on the gun with the target, fire! Align the ruler and the middle of the paper and then cut it straight.
It really deped which way you need it put.
That dose look good. I would take out from "...or based on facts". Art is mainly based off of opinion. I would say that "Art and what it has done has changes the world greatly."
Hopes this helps.
