fall back on a dictionary ----> look up some words
famous ----> well-known
fascinating ----> very interesting
feeble ----> weak
feedback ----> opinion
ferry ----> boat
field trip ----> class activity
fill her shoes ----> take her place
fill in for ----> replace
fill out the form ----> complete a form
financial aid ----> money
fine ----> charge
finish ----> complete
finish first ----> win
fix ----> repair
floor ----> department store
fly by ----> pass
forget ----> remember
four o'clock ----> that afternoon
freeze ----> cold
furnace ----> heating system
责任编辑：虫虫
