把下列每组句子合并成一个含定语从句的复合句
1. The teacher pointed out the mistakes. The students hadn't corrected them.
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2. We'll discuss the questions. He raised them yester­day.
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3. Do you know the student's address? Her name is Jenny.
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4.I met my teacher in the street yesterday. He taught me Chinese three years ago.
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5. The child is a very good student now. You saved him in the earthquake.
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6. That was the best exhibition(展览).It was shown in this city last year.
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