Answer:
The mayor commemorates and gives praise to those who were killed while building the bridge
Explanation:
Phrases like "a number of lives have been lost", "faithfully unto the death no less than of that great army of men who have wrought year in and year out, to execute the great design" and "Let us give our meed of praise to-day" is the sign of the mayor praising those who died whie building the bridge.
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They use more persuasive language and facts and not "believe" or wishy-washy words. They sound confident.