. You ___ wear a helmet while riding a bike. ...

[ Modal Verbs ]

. You ___ wear a helmet while riding a bike.

A. mustn’t

B. have to

C. can

Select your answer:
A B C D E

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Prepositions and Phrasal Verbs Tenses Modal Verbs & Perfect Infinitive Verb Tenses (Progressive, Perfect)Present, Past and Future Tense Asking & Giving Opinion TOEFL Apostrophes and Grammar Verb Moods and Vague Pronouns Toeic Verb

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