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The "Big Dig" (the Central Artery/Tunnel Project) has been complex and challenging. Located in Boston, Massachusetts, this tunnel is eight lanes wide and more than three miles long. What is most amazing about this tunnel is that it is constructed under a major highway and skyscrapers located in Boston’s financial district. Construction crews used "clamshell excavators" during this dig. These machines carved narrow trenches, and then a special substance was pumped into the trench to keep the dirt from caving in. Finally, steel beams were lowered into the trench and concrete was pumped in.
Explanation:
The sentences with words that are punctuated and spelled correctly are "Located in Boston, Massachusetts, this tunnel is eight lanes wide and more than three miles long.", "These machines carved narrow trenches, and then a special substance was pumped into the trench to keep the dirt from caving in.", and "Finally, steel beams were lowered into the trench and concrete was pumped in".
What is punctuation?
"Punctuation is the use of spacing, conventional signs, and certain typographical devices as aids to the understanding and correct reading of written text, whether read silently or aloud."
The sentences with words that are punctuated and spelled correctly are "Located in Boston, Massachusetts, this tunnel is eight lanes wide and more than three miles long.", "These machines carved narrow trenches, and then a special substance was pumped into the trench to keep the dirt from caving in.", and "Finally, steel beams were lowered into the trench and concrete was pumped in" as "Boston," is a place and has to be written with its first letter capital, after "trenches" there has to be comma and the sentences are separated by a conjunction and "Finally," is correct as "a comma is used after conjunctive adverbs".
To learn more about correct punctuation here
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