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根据上下文，选择适当的单词完成短文
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carefully worried had
visited trip
Waterfall took travelled safety bought
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Last weekend, the children went on a to the mountains. They there with their teachers by train. They the natural beauty. In front of the , some of the children photos, some of them drank water and ate food. Some of them some special fruit in the small shop. They a happy time. Their teacher watched them . She about their .
