Questões de Concurso Sobre inglês para técnico de instrumentação

Refer to the above text to judge the following item.  

“it”, in “which it usually is” (ℓ.30), refers to gasohol.

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“so long as” (ℓ.29) can be correctly replaced by provided.

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“rule of thumb” (ℓ.29) is related to experience.

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The use of “So” (ℓ.28) indicates that what follows is a consequence of what was previously mentioned.

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“fewer” (ℓ.27) is the opposite of more.