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complete the sentences with words that are punctuated and spelled correctly.
the "big dig" (the central artery/tunnel project) has been complex and challenging. located in
massachusetts, this tunnel is eight lanes wide and more than three miles long. what is most an
is that it is constructed under a major highway and skyscrapers located in boston's financial di:
construction crews used "clamshell excavators" during this dig. these machines carved narrow
special substance was pumped into the trench to keep the dirt from caving in.
stee
into the trench and concrete was pumped in.
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