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Identify Downstream: Refining and Marketing type of text:
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Which of the following impurity is not present in crude oil:
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Phrasal verbs are expressions made up of a verb with a preposition or adverb or both, that together act as a completely new verb with a meaning separate from those of the original words.
Identify the appropriate phrasal verb, which covers the same meaning of to increase in (...) tetraethyl lead was added to gasoline in the United States in the 1920s in order to increase the octane: 
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"By 1996, with the establishment of new federal standards of air pollutants, tetraethyl ______________ to gasoline in the U.S." is suitably filled in with: 
Read the excerpt:

"The school was a second home for many of those children — not because it resembled one, but because they had no other safe place to be."

What is the author's main purpose in this sentence?