Choose the correct answer or phrase to fill in the blank. Each question has only one correct answer.
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auto
- autos
- autoes
axis
- axii
- axes
basis
- basis
- bases
child
- children
- childs
crisis
- crisis
- crises
criterion
- criteria
- criteri
datum
- data
- datas
die
- dice
- dii
foot
- feet
- footen
focus
- focusi
- foci
goose
- geese
- goose
index
- indexes
- indices
louse
- lousy
- lice
man
- men
- mens
medium
- media
- medi
mouse
- mice
- mouses
oasis
- oasis
- oases
ox
- oxen
- oxes
parenthesis
- parentheses
- parenthesi
passerby
- passerbys
- passersby
piano
- pianos
- piani
radius
- radiuses
- radii
series
- series
- serii
sheep
- sheeps
- sheep
solo
- soli
- solos
species
- species
- specii
stimulus
- stimuli
- stimulii
tooth
- teeth
- tooths
trout
- trout
- troutes
woman
- women
- womans
Original Quiz with Answers at: http://esl.about.com/library/quiz/bl_plurals2.htm
