[ Modal Verbs ]
Students (pay) attention to the teacher if they want to learn.
A. have to
B. must
C. should
D. mustn’t

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Grammar › ViewWe keep the …………… copies of all our reports in a special master file.
A. primitive
B. characteristic
C. original
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Modals of Obligation & Prohibition › View
He _____ wear a helmet when riding his bike.
A. must
B. can