The theory of relativity ____ a major breakthrough in 1905.
A. was
B. is
C. will be
D. being

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Present Simple/AffirmativeVerb Patterns / IngContrastive ConjunctionsRelative - ConditionalAbstract NounsNarrative TensesCardiology ServicesPrepositions and TensesProgressive TensesContrast Linking WordsOther quiz:
Grammar › ViewLast month he booked a vacation to Florida– and _____ his plane!
A. lost
B. missed
Conditional Sentence › View
What is the pattern of conditional sentence type 2?
A. Subject+would+verb 1 — If + subject+verb2
B. Subject+will+verb 1 — If + subject+had+verb 3
C. Subject+will+verb 1 — If + subject+verb 1 (+s/es)
D. Subject+will+verb 1 — If + subject+verb 1
Conditional Sentences › ViewShe didn’t do the test because it was too difficult.
A . If the test had been too difficult, she could have done it.
B . If the test hadn’t been too difficult, she could have done it.
C . If the test were not too difficult, she could do it.
D . If the test hadn’t been too difficult, she couldn’t have done it.
Vocabulary and Grammar › View
Which word means “to hurt”?
A. leave
B. harm
C. selfish
D. difficult
