Fee一般多做广义的“费用”来用。
例句:have you paid the tuition fee for this semester?
Fare一般多做“路费、票价(机票、车票)”来用,是一个较为低频的词汇,实际中用到的比较少。
例句:I didn't bring enough money for the taxi fare.
Fair一般多做“公平”来解释,也作为“美丽的、美好的”来解释,这层意思在holy bible里常会看到用来形容女子。
例句:He won the game fair and square.
例句:《圣经》中《创世纪》第十三章:and it come to pass, that, when Abram was come into Egypt, the Egyptians beheld the woman that she was very fair.