[ Essential and Nonessential Clauses ]
Which of these is needed to make the sentence make sense?
A. Essential clauses/phrases
B. Nonessential clauses/phrases

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Grammar and Vocabulary › ViewThis book is ________ interesting than the one I read before.
A. not
B. less
C. least
Present Progressive › View
Mary and Peter ____ __________ the house
A. is painting
B. am painting
C. are painting
D. painting
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A. Past Simple
B. Past Continuous
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Narrative Tenses › View
He ______ for an hour before he realized it was time to leave.
A. worked
B. was working
C. had been working