"obstacle" and "system" are singular. Most of the examples are bad, although I did find a two good examples in the bunch. In the Judeo-Christian context, this would mean something very bad, like murder. This is a student trying to sound fancy but instead making no sense.
How to Write an, essay - Examples of, good and Bad Writing
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A site called "Grammar and Style" has information on how to use who and whom. His mother gave birth to Smith three months after Smith senior died. Lastly, the inverse relationship between technology thesis area and the tangent were never attained. My forty-year-old feet ached, and I felt a bit sad to think that in a couple of days I would be leaving California, my vacation over, to go back to my desk. Secondly, you will need to provide strong essay arguments, based on collected data. Its all in your pitch. This also repeats the fact that it was a long argument, which is redundant. "So" in this context is colloquial and should be omitted. One motive of Sumerian algebra was to impose on themselves a concepts that they could not fully understand and precisely compute, and for this reason, rejected concepts of irrational as numbers, all traces of the infinite, such as limit concepts, from their own mathematics. If this is the case, it is a"tion from a source and should be cited. That would help readers gain a new vision on the topic and bring ideas altogether to create a new but related meaning.