Rút gọn mệnh đề quan hệ (Dùng "which", "whose", "whom", "where", "why", etc.)

My sister bought a new laptop. Its battery lasts for 10 hours.
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He finally met the author. He had been admiring her books for years.
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I couldn’t understand the reason. He left the party so suddenly for that reason.
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They live in a house. The roof of the house is covered with solar panels.
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The restaurant serves delicious food. We had dinner there last night.
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