Below is a text with blanks. Click on each blank, a list of choices will appear. Select the appropriate answer choice for each blank.
下面的文本有一些空格。点击每个空格会出现一组选项，请为每个空格选出最合适的答案。
Some birds of prey have learned to control fire, a previously thought to be unique to humans. The birds appear to deliberately spread wildfires in order to out prey. The finding suggests that birds may have us to the use of fire.
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