[ Modal Verbs ]
Students ____________ bring their own calculators to the Math exam.
A. don’t have to
B. mustn’t
C. can

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Grammar › ViewLast year I _____________ Cambodia with my school mates.
A. travel
B. travels
C. travelled
D. travelling
Past Continuous Tense & Past Modals › View
I don’t know where they went, but they … gone to Paris od Italy
A. could have
B. must have