b. plateau.
c. capacity.
d. crest.
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my essay
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while I waited
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-I wore my special hiking boots so that I would not lose my grip.
-I won't leave you alone until you retreat from the edge.
-You are going to fall off the cliff, unless you move back.
Answer: A. Nominative.
Explanation: there are three pronoun cases in English: Nominative (or subjective), objective and possessive. The nominative case is when the pronoun acts as the subject of a sentence (this pronouns are I, you, he/she/it, we, they and who). The objective case is when the pronoun acts like the object of a sentence (they are me, you, him/her/it, us, them and whom). And the possessive case are pronouns that show that something belongs to someone (they are my, your, his, her, its, their, our, mine, yours, his, hers, ours, and theirs). In the given sentence the pronoun "I" is the subject of the phrase, so it is the nominative case.
b. considering your audience, putting ideas on paper, and sharing your writing
c. choosing and narrowing a topic, considering your audience, and gathering details
d. correcting grammar and spelling errors, and improving mechanics
option c is the answer