freebie  (n. informal) a give-away, a free promotional product免费赠品

[例]  I got two freebies of the theater. Let’s go this evening.

freehold (n.)an estate held in fee or for life享有全权的或可终身保有的不动产

free gift (n) an extra item given free with a purchase to encourage sales 赠品

[例] If you buy this cell phone, you will receive a free gift with it.

freelance  (adj, n) a person, especially a writer or an artist, who sells his or her services to employers without a long-term commitment to any one of them 自由职业

[例] She is working as a freelance---writing and make a living from sale of her books .

frequent flyer one who frequently take air-flight for business trip 经常乘飞机出差的人

frill  (n.) a luxury 奢侈品

[例]  Now non-frill flight are more popular with frequent flyers.

fringe benefits extra benefits 额外福利