For the first question regarding the tone of the poem, the best lines that convey a tone of hope and faith are:
A. God of our weary years, / God of our silent tears, / Thou who hast brought us thus far on the way;
These lines express a sense of gratitude and reliance on God, indicating a hopeful tone.
For the second question about Johnson's choice to use the word "Shadowed" in line 29, the most fitting explanation is:
A. He hopes that, metaphorically, the hand of God will be directly above his people, guiding and protecting them.
This interpretation suggests that the imagery of "shadow" conveys a protective presence rather than darkness.