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Questões por página:
Consider the sentences below and choose the one that demonstrates correct subject-verb agreement:

"Neither the teacher nor the students (1) _____ responsible for the missing equipment. Each of them (2) _____ willing to cooperate in the search. However, none of them (3) _____ seen it recently".
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According to the text, gene therapy intends to
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No trecho do texto – it most likely will integrate into a chromosomal site different from the defective allele – o termo em negrito indica 
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The part of the text that indicates that an unwanted problem may happen is: 
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De acordo com o texto, é fundamental que experimentos com culturas de células in vitro