[ a, an, the, Zero Article ]
Roentgen was ___ German physicist who discovered x-rays, revolutionizing medical diagnosis.
a. a
b. an
c. the
d. X [Nothing]

Random Topics:
Grammar of Future Planstake, make, doGrammar and VocabulariesZero Conditional SentencePast Tense vs Present TenseConditionals and Modal VerbsPreposition of PlaceAdjectives and DegreesToeic VerbSimple Past TensesOther quiz:
Present Tenses › ViewMy brother sometimes ______________ swimming at the weekend.
A. going
B. goes
C. go
Grammar › View
Choose the correct sentence in present continuous (be + verb + -ing)
A. I am making a cake for the birthday
B. I making a cake for the birthday
C. I make a cake for the birthday
Vocabulary › ViewWhat does “garrulous” mean?
A. Reserved
B. Chatty
C. Reticent
D. Talkative
Tenses › View
I think that they _____ (arrive) tomorrow morning.
A. will arrive
B. arrive
