[ Modal Verbs ]
Passengers _______ smoke until the signs have been switched off.
A. mustn’t
B. can’t
C. needn’t
D. mightn’t

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Vocabulary and grammar › ViewAfter working hard for hours, the farmers sat down and ___________ a short rest.
A. get
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C. do
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A __ of dirty clothes was strewn on the floor.
A. box
B. pile
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