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A. <span><span>I'd love to stay and talk, but—yikes! I'm really late now.
</span>This is the correct answer. The dash here is used properly because it shows the break in thought, and it changes the tone of the speaker. That is one use of dashes.
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B. </span></span><span>Today we studied a poem, did an experiment, and multiplied fractions. (The sentence doesn't need the dash.)
C. </span><span>The coat—one of the most colorful that I've seen--seemed to be made of string. (It needs another dash after seen.)
</span>D. <span>There on the stage was my sister! (Does not need the dash.)</span><span>
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1. true
2. ?
3. false (i think, I'm not 100% sure)
4. false (i think, I'm not 100% sure)
5. true (i think)
6. aerobic means: requiring free oxygen, so i think false
To be really honest, I think its a matter of opinion on which sentence is the strongest conclusion. To me, I think choice C is the best answer because it paints the contrast between the dog's wild instincts versus loyalty. I guess the conclusion should also mention that despite the abuse, Buck still learned to trust a human (even though one could easily understand why the dog would never trust a human after the abuse), so it shows just how powerful loyalty can be.
The summary of "The Rocking-Horse Winner" is the following:
Hester is dissatisfied with her life because she has no luck and her husband does not make as much money as she would like. Her son Paul begins to place bets on horse races together with his uncle and the gardener, and the horses he chooses actually win. He and his uncle decide to give his mother a gift of five thousand pounds, but he becomes ill. The day of the Derby he wins eighty thousand pounds, and he confesses his mother that he can guess the name of the winner horse by riding his rocking horse at home and reaching a psychic state of mind. Finally, he dies that night, and Hester feels that he is doing better now that he is dead than riding a rocking-horse in order to make money.