The book is 10 yuan.The ruler is 2 yuan.The pen is 8 yuan.The ruler is the c_____ of all.阅读句子,根据句意及首字母提示完成句子.

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The book is 10 yuan.The ruler is 2 yuan.The pen is 8 yuan.The ruler is the c_____ of all.
阅读句子,根据句意及首字母提示完成句子.

The book is 10 yuan.The ruler is 2 yuan.The pen is 8 yuan.The ruler is the cheapest_____ of all.