All passengers ___ turn off their mobile phone. A. shall ...

[ Modal Verb ]

All passengers ___ turn off their mobile phone.

A. shall

B. must

C. must not

D. may not

Select your answer:

Random Topics:
Gerund, Infinitive, Bare Verb Grammar & Vocab Grammar Past and Future Tense Intermediate Prepositions Preposition and Conjunction Coordinating and Subordinating Conjunctions Was and Were Possessive Nouns Past Participles

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