Foundation
English
Verb
Question
Book and buttons ___5___ be polished daily.
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Solution
Option C is the correct answer because 'must' expresses compulsion or a strong obligation as polishing is a necessity.
Option A is incorrect because 'can' is used to express ability or probability which is not correct here because polishing is a necessary rule and not a choice.
Option B is incorrect because 'will' is used to talk about the future – to say what we believe will happen, or to talk about what people want to do or are willing to do or to make promises and offers, which is not correct in this case.
Option D is incorrect because 'shall' is used to make offers and suggestions, and to ask for advice, which is not correct here.
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