[ Past Continues Tense ]
I ___________________________ when I heard a loud knock on the door.
A. is sleeping
B. am sleeping
C. was sleeping
D. were sleeping

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Verb ConjugationConditional Sentences Type I, IIProgressive Verb TensesPresent Progressive or Present SimpleSimple vs Continuous Past TenseInfinitive FormsModals and Semi-ModalsMoods of GrammarVerbs and AdverbsModal Verbs in ConditionalsOther quiz:
Grammar › ViewMoscow is one of the most important cities in Russia.
A. Moscow is more important than most other cities.
B. Moscow is more important than most other cities in Russia.
C. Moscow is more important than any other city in Russia.
D. Moscow is not as important as other cities in Russia.
Vocabulary › View
Which word would best describe a state of unease or anxiety?
A. Disquiet
B. Prickly
C. Mesmerize
D. Adaptable