[ Grammar ]
Visitors are asked to abstain ___________ smoking on the premises.
A. on
B. from

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Must or Mus not › ViewWe _______ run in the hall.
A. must
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We ______ talk with each other during class.
A. mustn’t
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Identify the subordinate clause in the sentence:
You must do the grammar lesson unless you have already mastered it.
A. unless
B. do
C. mastered
D. lesson
