一、不同国家关于乳牙脱落的风俗习惯各不相同。请阅读下面短文，用方框中所给单词的适当形式填空。每个单词限用一次。
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How do you deal with your baby teeth? Different cultures follow different 1. when a child's baby teeth fall out. In China, children throw 2. fallen baby teeth onto the roof of a 3. . It is said that a magpie (喜鹊) will come and take 4. these teeth. Later, the magpie will return with 5. healthy teeth for children.
In Mongolia (蒙古国), besides birds, dogs also take away children's fallen baby teeth. Dogs are 6. valued in Mongolian culture. By tradition, if children's fallen baby teeth are fed to dogs, their new teeth will grow in good and 7. condition.
Many children in Western countries expect the Tooth Fairy (牙仙) to leave money or presents in exchange for their fallen baby teeth. The story probably began in England or Ireland. According to 8. , a child puts a fallen baby tooth under his or her pillow (枕头) 9. going to bed. In the early morning, 10. the child is still sleeping, the Tooth Fairy takes away the tooth and leaves 11. else under the pillow. In France, the Tooth Fairy leaves a small gift or candy. In the US, the Tooth Fairy usually leaves some money.

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