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Modal verbs in English express notions such as obligation, possibility, permission, and ability, varying according to the communicative context. Consider the sentence: "Students ___ wear uniforms at this school; it is a mandatory rule." Choose the alternative that presents the modal that expresses obligation and appropriately fills the gap.

Students complete the sentence “The teacher _____ lives in Rio is from Canada.” The grammar focus of this exercise is:
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No trecho – However, police officers in the line of duty should know not only what the rules are – a palavra should pode ser substituída, sem alteração de sentido, por
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In “The crew did everything they could (...)”, the modal “could” is used to indicate
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In the topic “Forced and early marriage” (line 56), the modal verb can be replaced by ____ without changing the meaning.