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Questões por página:
A teacher is discussing classroom responsibilities with students and writes:

“Students ______ respect different opinions during discussions.”

Considering the communicative meaning of the sentence, the modal verb that best expresses obligation or expectation is:
The modal verb in “Then you must begin today” (3rd line) expresses  

Read the excerpt below.



"However, this also places new demands on operators — they must learn to manage energy efficiently, closely monitor power consumption, and plan vessel speed in a more rational manner."



In the excerpt, the modal verb "must" expresses:

Mark the correct alternative according to the modal verbs: 
mostrar texto associado
Leia a parte do texto Three pillars of information security: the CIA triad para responder à questão.
No trecho do item Confidentiality “organizations should enact measures”, o termo destacado em negrito pode ser substituído, sem alteração de sentido, por