Which of the following words is in singular form?

| December 25, 2016 | English Language and Literature, 37 BCS Preliminary
  • Formulae
  • Agenda
  • Oases
  • Radius

SingularPlural
FormulaFormulae/Formulas
AgendumAgenda
Oasis (মরূদ্যান)Oases
RadiusRadii

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