The o______ of all these words are unknown.

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Theo______ofallthesewordsareunknown.Theo______ofallthesewordsareunknown.Theo______ofallthesewordsare

The o______ of all these words are unknown.
The o______ of all these words are unknown.

The o______ of all these words are unknown.
origins 意思是起源
应该用复数形式,Words是复数
这些单词的起源是未知的、