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根据下句子的意思及所给的汉语提示,写出空缺处单词、固定短语或固定搭配的正确形式。 1. After dinner, taking a walk can keep you _______ (健康). 2. The plane _______ (起飞) in half an hour. Let's get ready. 3. _______ (树叶) turn green when spring is coming. 4. My clock _______ (响) every day. 5. We have to stay at home. It's raining (大).