Can you pick the correct ending to these irregular plurals?

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Now Play: Homonyms

One bacterium,

two bacteri-

two bacteri-

One criterion,

two criteri-

two criteri-

One quantum,

two quant-

two quant-

One penny,

two pen-

two pen-

One radix,

two radi-

two radi-

One matrix,

two matri-

two matri-

One formula ,

two formula-

two formula-

One nebula,

two nebula-

two nebula-

One ox,

two ox-

two ox-

One woman,

two wom-

two wom-

One genus,

two gen-

two gen-

One analysis,

two analys-

two analys-

One axis,

two ax-

two ax-

One nucleus,

two nucle-

two nucle-

One cactus,

two cact-

two cact-

One mouse,

two m-

two m-

One calf,

two cal-

two cal-

One elf,

two el-

two el-

One knife,

two kni-

two kni-

One beau,

two beau-

two beau-