合并句子。
l. Have you done the homework? Miss Zhao gave it to us yesterday.
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2. The detective found the thieves. They robbed the bank.
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3. My father works in a university. It has over five thousand students.
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4. The baby is my aunt's newborn daughter. The baby-sitter is taking care of  her.
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5. The boy is very clever. He is wearing a black jacket.
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