[ Prepositions of Time ]
________ the 21st century.
A. in
B. on
C. at

Random Topics:
Verbs & AdverbsPast Simple or Past ContinuousGrammar of Conjunctions and PrepotitionsAdjectives-Comparison, SuperlativeFuture Simple TensesSimple Present Continuous TenseHope, Thank, Modal VerbsPresent/Future/Past Simple/Present PerfectGerunds and InfinitivesVocabulary and DefinitionsOther quiz:
Grammar › ViewIs / it isn’t
A. Yes, you are.
B. Yes, it is
C. Yes, I am.
D. Yes, I am.
Prepositional Phrases › View
You can ask … assistance in shops.
A. for
B. —
C. by