Fill in the blank with the most appropriate word.
He thought he ________ able to find more information on British imperialism.
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Here, 'would be' is correct because it is used to describe someone who is hoping to do something or get something. Here, it is 'getting' more information on British imperialism.
'Will be' is incorrect because it is used for showing that somebody is willing to do something.
'Is' is incorrect as it is used to indicate something that is due or destined to happen.