[ Grammar ]
Her children ____ their homework yet. They are still working on it.
A. hasn’t finished
B. hasn’t finishing
C. haven’t finished
D. haven’t finishing

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A. subordinating conjunction
B. subject
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Rob _____ a problem while he _____ the surveillance system.
A. discover / checked
B. discovered / was checking
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Select the correct past tense form of ‘to be’ for the sentence: ‘It ___ a sunny day.’
A. beed
B. was
C. am
D. were
