Complete the table. Note that some of these words of foreign
origin have regular plurals.
| Singular | Plural | Singular | Plural |
| 1. cactus | cacti, cactuses | 13. memorandum | memoranda, memorandums |
| 2. analysis | analyses | 14. stadium | stadiums, stadia |
| 3. stimulus | stimuli | 15. museum | museums |
| 4. stratum | strata | 16. addendum | addenda, addendums |
| 5. datum | data | 17. radius | radii |
| 6. curriculum | curricula, curriculums | 18. drama | dramas |
| 7. basis bases | 19. genius | geniuses | |
| 8. fungus | fungi, funguses | 20. appendix | 1. appendices; 2. appendixes- (see the difference in meaning in a good dictionary) |
| 9. genus | genera | 21. axis | axes |
| 10. index | indices, indexes | 22. medium | media |
| 11. crisis | crises | 23. album | albums |
| 12. criterion | criteria | 24. phenomenon | phenomena |