★ Modals of Obligation and Permission
I _____ forget to take my library books back on the way home.
A. mustn’t
B. don’t have to
C. have to
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If I _______ leave work early because I don’t feel well, I can do that without a problem.
A. allowed to
B. don’t have to
C. can’t
D. need to
E. supposed to
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