Following Pothier you would omit the final note when singing oxytonic texts. Following Mocquereau you would use the normal paroxytonic ending, placing the final accented syllable on the final (low) note.
The adaption of the text "Teach us Your ways, Lord" to "Teach us Your ways, O Lord" is a correct alternative translation since "Lord" is in the vocative sense and "O Lord" is an appropriate translation.
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