[ a, an, the, Zero Article ]
Einstein is known for his theory of ___ relativity.
a. a
b. an
c. the
d. X [Nothing]

Random Topics:
Have as verb and auxiliaryNounsProgressive TenseReported SpeechApologizingGrammar, adverbs of frequency placementAuxiliary and Modal VerbsPast and Present TensesTenses of VerbsPreposition of DirectionOther quiz:
Future Tense › ViewIf you are late for class, the teacher ___________ you.
A. will get
B. will turn
C. will do
D. will punish
Science › View
The science or branch of biology dealing with animals.
A. Zoology
B. Animalism
C. Botany
D. Sedimentology
They _______ new apartments right now
A. will build
B. are building
C. are build
D. built
Action vs Linking Verbs/ Verb Phrases › View
Identify the verb or verb phrase:This was a great day!
A. This was
B. was a
C. great day
D. was