Final answer:
The word that best completes the sentence to give it a positive tone is 'donate'.
Step-by-step explanation:
The word that would best complete the sentence to give it a positive tone is donate. Gretchen would always donate pantry items and clothing to the people at the local shelter. By using the word 'donate', it suggests that Gretchen is willingly giving her belongings to help those in need, which is a positive action.
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