[ Subject Verb Agreement ]
The astronomers at the observatory (study, studies) the stars at night.
A. study
B. studies

Random Topics:
Grammar (want to/ need to/ have to)Reported Speech and Reporting VerbsGrammar-Verbs & Nouns Singular, Plural, GenderVerb, Object, PrepositionVerbs and Possessive AdjectiveFuture Simple TensesOn, At, ByVerb AgreementModals for Ability, Possibility and PermissionQuantifiers and ArticlesOther quiz:
Phrasal Verb › Viewput through
A. be a candidate for an election
B. suggest/propose
C. connect by phone
D. put something to its proper place
Plural › View
What’s the plural of bison?
A. Bison(s)
B. Bisones
C. Bisonies
I was not afraid to come. You ________________ come with me.
A. should have
B. must have
C. can’t have
D. needn’t have
Grammar › View
Music should be a(n) __________________ part of children’s education.
A. integral
B. mutual
C. feasible