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No trecho do primeiro parágrafo – However, it should be noted that cell culture experiments – o termo em negrito pode ser substituído, sem alteração de sentido, por 
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In the fragment from the third paragraph: “they may move gradually towards the broader logistical duties of a company manager”, the word in bold indicates
Which of the sentences below express the correct use of the words "can" and/or "can't"?
Which of the alternatives expresses the verbs in past simple form correctly? 
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Which sentence from the text correctly uses a modal verb to express necessity or obligation?