[ Grammar ]
While I ___ TV last night, the lights went out.
A. watch
B. am watching
C. watched
D. was watching

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Prepositions and TensesVerb-ing or to VerbHow often - long - much - manyPrepositions & Modal VerbsDemonstrative PronounsAlong & AgainstTenses and Figurative LanguageJobsQuantifiers & Modal VerbsComparative Adjectives and AdverbsOther quiz:
Narrative Tenses › ViewTen years ago, people _________ (walk) long distances to find water.
A. was walking
B. were walking
C. had walking
Conjunctions › View
Do you want to sit on the chair _____ on the ground?
A. and
B. or
Clauses and Conjunction › ViewStudents ____ study hard get good grades.
A. who
B. whose
C. which
D. where
Grammar › View
He will practice his musical piece soon.
A. article
B. adjective
C. noun
D. preposition
E. adverb