It is an exclamatory sentence it should end in (!)
These are all the prepositions
for
Assuming this question is asking for a definition/synonym/"other word" for chivalrous, the answer is courteous. leaving a more comfortable seat for an elderly person is a respectful and polite gesture, which shows courtesy.
”If people are doubting how far you can go,
go so far that you can’t hear them anymore.”
-Michele Kuiz
