Which sentence uses the correct article?
A. A sun is a star at the center of a solar system.
B. An sun is a star at the center of a solar system.
C. The sun is a star at the center of a solar system.

Random Topics:
Conditionals and WishesPresent Perfect or Past Simple TensePresent Continuous, Present Perfect and Used toAdverb PhrasesUnless If First ConditionalWill vs be going toNounComparatives and SuperlativesPronouns ( Interrogative )Regular and Irregular AdverbOther quiz:
Modals of Necessity and Suggestion › ViewWhen you’re in an argument, how important to you is it to be right? Do you think it should be more important or less important to you?
It (1)___________ definitely be less important to me.
A. should
B. must
C. needs to
D. ought
Modals for Deduction › View
If it’s raining, he can’t be playing outside. What does this imply?
A. He is playing inside.
B. He is playing outside.
C. It is not raining.
D. He is not playing outside.
Subject, Object, Possessive Pronoun and Possessive Adjectives › ViewThis is not my house. It is ________.
A. They
B. them
C. theirs
D. Their
Passive Voice › View
Mr. Wilson is _______ as Willie to his friend.
A. known
B. knew
C. is known
D. know
