No they aren't proper to use in writing class they are considered slang. It would show your teacher that your not interested in sounding educated and proper.
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Damage the purity or appearance of mar or spoil
Science fiction (sometimes shortened to sci-fi or SF) is a genre of speculative fiction that typically deals with imaginative and futuristic concepts such as advanced science and technology, space exploration, time travel, parallel universes, and extraterrestrial life.
The answer is C. It's the only one that points out the that the student is contradicting herself.
The answer to this question would be true
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