I. 将下面各题中的两个句子合并为一个含有定语从句的句子。
1. I’m reading a book. The book is about hobbies.
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2. The film is very interesting. We saw the film last night.
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3. The boy is my best friend. The boy is twelve years old.
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4. They visited a natural wonder. The natural wonder lies in the south of the country.
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5. The city was big and beautiful. I went to the city three years ago.
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