Based on the clue 'a letter from einstein to fdr is on display at the...', what is the answer?

Based on the clue 'a letter added to amiable gets you this word that ...', what is the answer? Based on the clue 'a letter added to spout causes it to do this begin...', what is the answer? Based on the clue 'a letter c in orange with white trim', what is the answer? Based on the clue 'a letter expressing thanks for hospitality is name...', what is the answer? Based on the clue 'a letter like p or d where some part of the mouth ...', what is the answer? Based on the clue 'a letter of introduction from this winesburg ohio ...', what is the answer? Based on the clue 'a letter of the alphabet or ones former spouse', what is the answer? Based on the clue 'a letter of this to a prospective employer outline...', what is the answer?