Test is the singular of TESt
The singular possessive form of "test" is "test's".
The possessive form for the singular noun driver is driver's.Example: I passed the test and got my driver's license today.
Class is a singular noun so add -'s. The class's test.
The singular form of the demonstrative pronoun 'these' is this.
The singular form of "that" is "it."
The singular form is cuff.
it is already in its singular form.
"Stratum" is the singular form of stratum. The plural form is "strata".
The form hypothesis is the singular form. The plural form is hypotheses.
A singular form of dice is a die
The singular form of feet is foot.
The singular form of Oases is, Oasis.