[ Modal Verbs ]
You …………… litter in the park. It’s not allowed.
A. needn’t
B. shouldn’t
C. mustn’t

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Vocabulary › ViewChildren usually have a _______ for pizza.
A. quandary
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Modals › View
Is it necessary for them to call you every day?
A. Do they have to call you every day?
B. Should they call you every day?