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根据句子意思及汉语提示,写出所缺的单词。 1. Susan plays the piano very _________ (好). 2. Have you ever _________ (骑) a horse? 3. I'm sure your cousins can do these exercises _________ (自己) 4. I love children, _________ (尤其,特别) when they smile. 5. My brother sleeps with the window open _________ (除非) it's really cold.