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根据汉语提示写单词。 1.How many _________ (国家) are there in the world? 2.This is the _________ (开始) of our tour. 3.Children should _________ (睡觉) for more than eight hours every day. 4.The girl is _________ (从未) late for school. 5.I think Beijing Duck is very _________ (美味的).