Here are the correct answers to your questions:
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Comían en el parque cuando empezó a llover. (This uses the imperfect tense for the action that was ongoing - eating in the park.)
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María fue a Perú el año pasado con su familia. (This uses the preterite tense to indicate a completed action in the past.)
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a continuous, habitual, or repeated action in the past (This is the primary use of the imperfect tense.)
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The fruit covered the road and blocked traffic. (The story mentions that the scattered fruits blocked the traffic.)
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He was running from the bank and ran into a fruit cart. (This reflects what happened in the news story.)
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Anabel caminaba a la oficina de correo todas las noches. (The imperfect tense is correctly used for habitual actions.)
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f. park
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g. sidewalk
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d. intersection
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a. traffic light
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e. bookstore
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Pablo corría cada semana, pero yo jugaba fútbol todos los días. (This sentence uses the imperfect tense to describe habitual actions and the preterite for completed actions.)
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Fernando caminó a la oficina de correo anoche. (The preterite tense is appropriate for a completed action in the past.)
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the decimation of the population by smallpox and civil war (This event significantly impacted the Inca empire, contributing to the abandonment of Machu Picchu.)
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actions that are completed, done, or over with (This is the primary use of the preterite tense.)
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Ramón siempre era un buen estudiante. (The imperfect tense is appropriate for describing a habitual state in the past.)
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He was led there by a Peruvian guide. (This is the story of how Hiram Bingham rediscovered Machu Picchu.)
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as a royal estate and fortress for Pachacuti Inca (This was one of the purposes for which Machu Picchu was built.)
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an ancient abandoned city (This accurately describes Machu Picchu.)
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near Cuzco, Peru (Machu Picchu is located in this region.)
Feel free to ask if you have more questions!