Sentence:  Mike remained in trance ; there was <WSD>much</WSD> to grok , loose ends to puzzle over and fit into his growing - all that he had seen and heard and been at the Archangel Foster Tabernacle ( not just cusp when he and Digby had come face to face alone ) - why Bishop Senator Boone made him warily uneasy , how Miss Dawn Ardent tasted like a water brother when she was not , the smell of goodness he had incompletely grokked in the jumping up and down and wailing - 
Meaning of the word marked with <WSD> tags:  (quantifier used with mass nouns) great in quantity or degree or extent