Three blanks/one blank

Why can’t the first black be exhaustive as it refers to thorough details?

I thought hopeless would be the best choice because government is providing small budgets to the scientists!

I guess “carefully selected” aligns better with selective, but I’m not super sure on this one. Where is it from?

“never been greater” means the support/budgets is as big as possible. So that’s not quite true

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Yes, selective is more suitable but as it is written assembled details I thought it is indicating comprehensive details! It’s from the hard section of KMF
Thanks for the help,