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根据句意, 从方框中选择正确的单词, 并用其正确形式填空。 southern, purpose, water, light, mail 1. Have you _____ the flowers? 2. She went into the room and _____ the fire. 3. My grandparents usually spend winter in the warm _____ province. 4. She sent all the books through the _____. 5. What is the _____ of your visit?