把下列每對(duì)句子連成一句，把第二個(gè)句子作為定語從句。
1. The man is in the next room. He brought our textbooks here yesterday.
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2. The magazine is mine. He has taken it away.
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3. The students will not pass the examination. They don't study hard.
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4. The woman ls our geography teacher. You saw her in the park.
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5. The letter is from my sister. I received it yesterday.
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6. The play was wonderful. We saw it last night.
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7. This is the boy. His sister is a famous singer.
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