flock
加入词篮flood
floor
flour
flourish
flow
flower
flu
fluctuate
fluent
fluid
flush
fly
fly
foam
focus
focus
fog
fold
folk
folk
follow
following
fond
food
fool
foolish
foot
foot
football
footstep
for
forbid
force
force
fore
forecast
forehead
foreign
foreign
foreigner
foremost
foresee
forest
forever
forge
forget
forgive
fork
form
formal
format
formation
former
formidable
formula
formula
formulate
formulate
forth
forthcoming
fortnight
fortunate
fortune
forty
forum
forward
fossil
foster
foul
foul
foul
found
found
foundation
foundation
fountain
fountain
four
fourteen
fox
fraction
fracture
fragile
fragment
fragrant
frame
framework
frank
fraud
free
freedom
freeze
freight
frequency
frequent
fresh
friction
Friday
fridge
