English plural nouns

One __________________.

• phenomena

• phenomenon

Many ___________________.

• phenomenon

• phenomena

Many_____________.

• octopus

• octopuses

• octopi

One______________, many _____________.

• oasis, oases

• oases, oasis

One ______________, many _______________.

• diagnosis, diagnoses

• diagnoses, diagnosis

Singular form of the word "data"

• datum

• data

One ____________, many _______________.

• crisis, crises

• crises, crisis

Many _________, one ____________.

• criteria, criterion

• criterion, criteria

• cactus

• cacti

• cactuses

One____________.

• basis

• bases