[ a, an, the, Zero Article ]
That’s John. He’s ___ police officer.
a. a
b. an

Random Topics:
Transition WordsCoordinating and Subordinating ConjunctionsPresent Simple and Present ContinuousModals of ObligationGrammar: AgreementRelative Clauses and etcAdjective / Noun + to InfinitiveConditional Sentence 0, 1Verbs - third personObject PronounsOther quiz:
Past Perfect Simple & Continuous › ViewHe ___ all over the world by his 30th birthday. (Past Perfect Simple)
A. had been travel
B. had to travel
C. had travelled
Grammar › View
Which of the following sentences correctly uses commas in a series?
A. I need you to pick up eggs, milk and bread.
B. I need you to pick up eggs milk, and bread.
C. I need you to pick up eggs, milk, and bread.
D. I need you to pick up eggs milk and bread.