In the text,

the relative pronouns which and that can be used after the word “topic” (l.43) without changing the meaning of the sentence.

In the text,

“thinking” (l.45) is in the -ing form because it comes after a preposition.

In the text,

the verb “Beware” (l.45) implies a warning.

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The words “one” and “ room”, separated by a hyphen (R.1), function as an adjective.

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The verb “were” (l.2) would convey the same idea if it were replaced by had been.

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The suffix “-ward”, in “westward” (l.3), means in a particular direction.

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The final “-ed” in “encouraged” (l.3), “worked” (l.5), “offered” (l.6) and “pooled” (l.13) is pronounced the same because its preceding sound is voiced.

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The verb “settle” (l.4) is to “settlers” (l.10) as teach is to teachers.

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The verb “clearing” (l.7) can be correctly replaced by to clear.

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The clause introduced by “even though” (l.7) is a concessive clause.