2 . It is reported that all surviving South China tigers are artificially raised. It is worrying. (合并为含有定语从句的复合句)
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3 . The highlight of the exhibition is the ink wash paintings from Song Dynasty. They are of exceptional beauty and full of life.（用定语从句改写）
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4 . Studying abroad takes us out of our comfort zone and changes us for the better. That is the most important from my point of view.(用定语从句改写)
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5 . 合并为含有定语从句的复合句
A famous craftsman showed us how to make them and displayed many of his art works. They are highly awarded.
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6 . You might often see overweight boys and girls. This means that young people’s weight has become a big problem. (用合适的连词合并成一句)
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7 . I have read many classic literary works. They broaden my horizons and improve my writing skills.(合并为含有定语从句的句子)

8 . 合并为含有定语从句的句子。
Once we arrive in Shanghai, we will live in a hotel. We have reserved the hotel online in advance.