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OpenStudy (anonymous):

Some of the Worlds largest cities depend on underground railway systems for urban transportation. 1) change worlds to Worlds 2) change worlds to world's 3) change the spelling of cities to citys 4) insert a comma after cities 5) change systems for to systems. For

OpenStudy (lgbasallote):

it should be "some of the world's..." because world's is possessive and it's in singular form does that help?

OpenStudy (anonymous):

it does, thanx

OpenStudy (lgbasallote):

welcome

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