Read the lines below. Then select the two excerpts from the poem that best support the main theme. Staunch it at its source / With cinder loads dumped down? The brook was thrown / Deep in a sewer dungeon under stone In fetid darkness still to live and run- And all for nothing it had ever done Except forget to go in fear perhaps. No one would know except for ancient maps That such a brook ran water. But I wonder If, from its being kept forever under, These thoughts may not have risen that so keep This new-built city from both work and sleep. ... Staunch it at its source / With cinder loads dumped down? The brook was thrown / Deep in a sewer dungeon under stone In fetid darkness still to live and run, No one would know except for ancient maps These thoughts may not have risen