[ Vocabulary ]
An event, condition, or factor that can be changed or controlled in order to study or test a hypothesis in a scientific experiment.
A. field study
B. trials
C. evidence
D. variable

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Modal Verbs for PossibilityAdverb Of PlaceActive and PassiveModals and AdviceDirect Object and Indirect ObjectModals for ObligationGrammar SuffixesIntermediate PrepositionsIdentifying Sentence TypesPassive Voice - Present ContinuousOther quiz:
Past and Present Tenses › ViewComplete with the correct form: “I ___ (visit) Paris three times so far.”
A. have visited
B. had visited
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By 2024, I ____ from college.
A. will graduate
B. have graduated
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- queued
- was queuing
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When Bob went to bed last night, he __________ (brush) his teeth.
A. brushes
B. brush
C. had brushed
D. had brush
