People (is / are) often ten or twenty years behind the times in their knowledge of the world.
Indirect QuestionPast Perfect Continuous TenseLeach vs. LeechModal VerbsPresent ContinuousIrregular AdjectivesBasic GrammarSimple PastTime Expressions
Other quiz: Antonyms
What is an antonym for turn on?
B. turn off
D. switch on
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