[ 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:
Grammar › ViewI’m going to visit your country. Where _______________ if I want to go shopping?
A. ought to I go
B. I should go
C. should I go
Linkers and Conjunctions › View
You can’t drive a car __________ you have passed your driving test.
A. while
B. until
C. meanwhile
Grammar › ViewThey _______ 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
