Sentence:  The fact seems to be that very many large branch stores are uneconomical , that the choice of location in the suburbs is as important as it was downtown , and that even highly suburbanized cities will support only so <WSD>many</WSD> big branches . 
Meaning of the word marked with <WSD> tags:  a quantifier that can be used with count nouns and is often preceded by `as' or `too' or `so' or `that'; amounting to a large but indefinite number