1 . Winter was coming on and the hills ______ villages with destruction, for heavy rain would not only wash away the soil but would cause serious floods as well. (根据句意填空)
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2 . The practice of tai chi aims to maintain ______ ______ of yin and yang in the body through opposite movements. Eventually, tai chi brings about a state of physical balance and mental peace. (根据句意填空)
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